periph/rtt: fix documentation
periph/rtt: fix documentation

Fix some typos, grammar and style.

robixnai/RIOT,DipSwitch/RIOT,beurdouche/RIOT,LudwigOrtmann/RIOT,ntrtrung/RIOT,gbarnett/RIOT,rajma996/RIOT,d00616/RIOT,msolters/RIOT,TobiasFredersdorf/RIOT,thiagohd/RIOT,l3nko/RIOT,miri64/RIOT,josephnoir/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,abkam07/RIOT,lazytech-org/RIOT,patkan/RIOT,aeneby/RIOT,gbarnett/RIOT,beurdouche/RIOT,RubikonAlpha/RIOT,smlng/RIOT,A-Paul/RIOT,kushalsingh007/RIOT,neiljay/RIOT,MarkXYang/RIOT,dhruvvyas90/RIOT,dkm/RIOT,neumodisch/RIOT,RBartz/RIOT,aeneby/RIOT,kYc0o/RIOT,tdautc19841202/RIOT,gautric/RIOT,PSHIVANI/Riot-Code,MarkXYang/RIOT,openkosmosorg/RIOT,mziegert/RIOT,centurysys/RIOT,rfswarm/RIOT,kYc0o/RIOT,cladmi/RIOT,ks156/RIOT,mziegert/RIOT,patkan/RIOT,ks156/RIOT,kYc0o/RIOT,kYc0o/RIOT,MohmadAyman/RIOT,marcosalm/RIOT,immesys/RiSyn,l3nko/RIOT,miri64/RIOT,jremmert-phytec-iot/RIOT,malosek/RIOT,EmuxEvans/RIOT,centurysys/RIOT,Hyungsin/RIOT-OS,asanka-code/RIOT,rousselk/RIOT,asanka-code/RIOT,robixnai/RIOT,gautric/RIOT,josephnoir/RIOT,mfrey/RIOT,syin2/RIOT,stevenj/RIOT,binarylemon/RIOT,FrancescoErmini/RIOT,cladmi/RIOT,marcosalm/RIOT,mtausig/RIOT,patkan/RIOT,kushalsingh007/RIOT,Josar/RIOT,jfischer-phytec-iot/RIOT,LudwigOrtmann/RIOT,kaspar030/RIOT,ks156/RIOT,kerneltask/RIOT,koenning/RIOT,MarkXYang/RIOT,jasonatran/RIOT,FrancescoErmini/RIOT,msolters/RIOT,OlegHahm/RIOT,chris-wood/RIOT,Darredevil/RIOT,x3ro/RIOT,jferreir/RIOT,brettswann/RIOT,luciotorre/RIOT,emmanuelsearch/RIOT,PSHIVANI/Riot-Code,khhhh/RIOT,bartfaizoltan/RIOT,jbeyerstedt/RIOT-OTA-update,avmelnikoff/RIOT,nsol-nmsu/RIOT,ant9000/RIOT,sgso/RIOT,LudwigOrtmann/RIOT,zhuoshuguo/RIOT,Osblouf/RIOT,jbeyerstedt/RIOT-OTA-update,kushalsingh007/RIOT,zhuoshuguo/RIOT,d00616/RIOT,hamilton-mote/RIOT-OS,msolters/RIOT,katezilla/RIOT,syin2/RIOT,Hyungsin/RIOT-OS,yogo1212/RIOT,attdona/RIOT,openkosmosorg/RIOT,plushvoxel/RIOT,DipSwitch/RIOT,rfswarm/RIOT,PSHIVANI/Riot-Code,RubikonAlpha/RIOT,benoit-canet/RIOT,ximus/RIOT,avmelnikoff/RIOT,phiros/RIOT,changbiao/RIOT,AnonMall/RIOT,rakendrathapa/RIOT,herrfz/RIOT-old,thomaseichinger/RIOT,tfar/RIOT,binarylemon/RIOT,sgso/RIOT,Osblouf/RIOT,Yonezawa-T2/RIOT,rfuentess/RIOT,automote/RIOT,PSHIVANI/Riot-Code,gbarnett/RIOT,rajma996/RIOT,arvindpdmn/RIOT,rfswarm/RIOT,marcosalm/RIOT,TobiasFredersdorf/RIOT,sgso/RIOT,attdona/RIOT,openkosmosorg/RIOT,dailab/RIOT,hamilton-mote/RIOT-OS,jferreir/RIOT,LudwigKnuepfer/RIOT,LudwigOrtmann/RIOT,RIOT-OS/RIOT,jremmert-phytec-iot/RIOT,latsku/RIOT,hamilton-mote/RIOT-OS,bartfaizoltan/RIOT,openkosmosorg/RIOT,stevenj/RIOT,kerneltask/RIOT,attdona/RIOT,x3ro/RIOT,herrfz/RIOT,d00616/RIOT,MarkXYang/RIOT,Darredevil/RIOT,emmanuelsearch/RIOT,kb2ma/RIOT,kbumsik/RIOT,OlegHahm/RIOT,khhhh/RIOT,benoit-canet/RIOT,tdautc19841202/RIOT,malosek/RIOT,altairpearl/RIOT,brettswann/RIOT,lazytech-org/RIOT,robixnai/RIOT,malosek/RIOT,syin2/RIOT,MonsterCode8000/RIOT,thomaseichinger/RIOT,altairpearl/RIOT,kbumsik/RIOT,gebart/RIOT,daniel-k/RIOT,Josar/RIOT,toonst/RIOT,binarylemon/RIOT,robixnai/RIOT,jbeyerstedt/RIOT-OTA-update,toonst/RIOT,katezilla/RIOT,toonst/RIOT,adjih/RIOT,MohmadAyman/RIOT,mfrey/RIOT,sumanpanchal/RIOT,herrfz/RIOT,toonst/RIOT,daniel-k/RIOT,abp719/RIOT,rajma996/RIOT,basilfx/RIOT,gebart/RIOT,basilfx/RIOT,1blankz7/RIOT,msolters/RIOT,benoit-canet/RIOT,biboc/RIOT,jferreir/RIOT,wentaoshang/RIOT,roberthartung/RIOT,rousselk/RIOT,roberthartung/RIOT,centurysys/RIOT,dailab/RIOT,mtausig/RIOT,arvindpdmn/RIOT,dhruvvyas90/RIOT,jasonatran/RIOT,yogo1212/RIOT,rfuentess/RIOT,EmuxEvans/RIOT,benoit-canet/RIOT,avmelnikoff/RIOT,dhruvvyas90/RIOT,l3nko/RIOT,kaleb-himes/RIOT,lebrush/RIOT,fnack/RIOT,OlegHahm/RIOT,adrianghc/RIOT,MohmadAyman/RIOT,neiljay/RIOT,avmelnikoff/RIOT,dailab/RIOT,Ell-i/RIOT,kaspar030/RIOT,authmillenon/RIOT,emmanuelsearch/RIOT,syin2/RIOT,neumodisch/RIOT,A-Paul/RIOT,benoit-canet/RIOT,DipSwitch/RIOT,kYc0o/RIOT,backenklee/RIOT,herrfz/RIOT,gautric/RIOT,ThanhVic/RIOT,gautric/RIOT,automote/RIOT,EmuxEvans/RIOT,immesys/RiSyn,mfrey/RIOT,ntrtrung/RIOT,Lexandro92/RIOT-CoAP,TobiasFredersdorf/RIOT,smlng/RIOT,cladmi/RIOT,arvindpdmn/RIOT,Osblouf/RIOT,RubikonAlpha/RIOT,jhollister/RIOT,automote/RIOT,LudwigKnuepfer/RIOT,yogo1212/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,bartfaizoltan/RIOT,phiros/RIOT,plushvoxel/RIOT,khhhh/RIOT,Hyungsin/RIOT-OS,phiros/RIOT,OTAkeys/RIOT,watr-li/RIOT,Ell-i/RIOT,Yonezawa-T2/RIOT,Darredevil/RIOT,chris-wood/RIOT,jasonatran/RIOT,stevenj/RIOT,ant9000/RIOT,EmuxEvans/RIOT,kushalsingh007/RIOT,sumanpanchal/RIOT,msolters/RIOT,katezilla/RIOT,OTAkeys/RIOT,jhollister/RIOT,herrfz/RIOT,RubikonAlpha/RIOT,lebrush/RIOT,RubikonAlpha/RIOT,x3ro/RIOT,kb2ma/RIOT,binarylemon/RIOT,d00616/RIOT,openkosmosorg/RIOT,brettswann/RIOT,dhruvvyas90/RIOT,ximus/RIOT,alex1818/RIOT,automote/RIOT,arvindpdmn/RIOT,biboc/RIOT,rakendrathapa/RIOT,robixnai/RIOT,thiagohd/RIOT,daniel-k/RIOT,OlegHahm/RIOT,neiljay/RIOT,alex1818/RIOT,tdautc19841202/RIOT,chris-wood/RIOT,latsku/RIOT,abp719/RIOT,TobiasFredersdorf/RIOT,AnonMall/RIOT,1blankz7/RIOT,neumodisch/RIOT,latsku/RIOT,roberthartung/RIOT,FrancescoErmini/RIOT,Yonezawa-T2/RIOT,asanka-code/RIOT,nsol-nmsu/RIOT,EmuxEvans/RIOT,alex1818/RIOT,ntrtrung/RIOT,Osblouf/RIOT,phiros/RIOT,lebrush/RIOT,kaspar030/RIOT,l3nko/RIOT,RBartz/RIOT,asanka-code/RIOT,nsol-nmsu/RIOT,l3nko/RIOT,AnonMall/RIOT,ntrtrung/RIOT,wentaoshang/RIOT,authmillenon/RIOT,PSHIVANI/Riot-Code,rousselk/RIOT,tdautc19841202/RIOT,mziegert/RIOT,automote/RIOT,immesys/RiSyn,patkan/RIOT,OTAkeys/RIOT,Yonezawa-T2/RIOT,Ell-i/RIOT,immesys/RiSyn,rfswarm2/RIOT,dhruvvyas90/RIOT,centurysys/RIOT,JensErdmann/RIOT,bartfaizoltan/RIOT,shady33/RIOT,kb2ma/RIOT,Lexandro92/RIOT-CoAP,khhhh/RIOT,rakendrathapa/RIOT,rousselk/RIOT,khhhh/RIOT,lazytech-org/RIOT,kbumsik/RIOT,altairpearl/RIOT,binarylemon/RIOT,Josar/RIOT,abp719/RIOT,centurysys/RIOT,herrfz/RIOT,plushvoxel/RIOT,zhuoshuguo/RIOT,watr-li/RIOT,rfswarm2/RIOT,EmuxEvans/RIOT,dkm/RIOT,mziegert/RIOT,plushvoxel/RIOT,jferreir/RIOT,kerneltask/RIOT,OTAkeys/RIOT,ximus/RIOT,jbeyerstedt/RIOT-OTA-update,adjih/RIOT,shady33/RIOT,chris-wood/RIOT,DipSwitch/RIOT,abkam07/RIOT,jremmert-phytec-iot/RIOT,brettswann/RIOT,adjih/RIOT,attdona/RIOT,gebart/RIOT,immesys/RiSyn,d00616/RIOT,malosek/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,luciotorre/RIOT,LudwigOrtmann/RIOT,tfar/RIOT,OTAkeys/RIOT,kaleb-himes/RIOT,roberthartung/RIOT,bartfaizoltan/RIOT,altairpearl/RIOT,fnack/RIOT,Yonezawa-T2/RIOT,LudwigOrtmann/RIOT,chris-wood/RIOT,hamilton-mote/RIOT-OS,daniel-k/RIOT,MonsterCode8000/RIOT,shady33/RIOT,d00616/RIOT,lazytech-org/RIOT,sgso/RIOT,1blankz7/RIOT,haoyangyu/RIOT,sgso/RIOT,changbiao/RIOT,changbiao/RIOT,aeneby/RIOT,smlng/RIOT,tdautc19841202/RIOT,khhhh/RIOT,kaleb-himes/RIOT,DipSwitch/RIOT,BytesGalore/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,miri64/RIOT,changbiao/RIOT,cladmi/RIOT,Ell-i/RIOT,phiros/RIOT,JensErdmann/RIOT,lebrush/RIOT,ant9000/RIOT,kushalsingh007/RIOT,MohmadAyman/RIOT,wentaoshang/RIOT,kbumsik/RIOT,haoyangyu/RIOT,rfuentess/RIOT,arvindpdmn/RIOT,1blankz7/RIOT,hamilton-mote/RIOT-OS,benoit-canet/RIOT,kbumsik/RIOT,jasonatran/RIOT,katezilla/RIOT,ntrtrung/RIOT,beurdouche/RIOT,yogo1212/RIOT,thomaseichinger/RIOT,brettswann/RIOT,mtausig/RIOT,rfswarm2/RIOT,josephnoir/RIOT,marcosalm/RIOT,RBartz/RIOT,BytesGalore/RIOT,LudwigKnuepfer/RIOT,gebart/RIOT,latsku/RIOT,thiagohd/RIOT,RubikonAlpha/RIOT,wentaoshang/RIOT,FrancescoErmini/RIOT,backenklee/RIOT,alignan/RIOT,TobiasFredersdorf/RIOT,MonsterCode8000/RIOT,ntrtrung/RIOT,haoyangyu/RIOT,watr-li/RIOT,1blankz7/RIOT,backenklee/RIOT,koenning/RIOT,stevenj/RIOT,abkam07/RIOT,lebrush/RIOT,changbiao/RIOT,Lexandro92/RIOT-CoAP,AnonMall/RIOT,josephnoir/RIOT,jfischer-phytec-iot/RIOT,Hyungsin/RIOT-OS,kb2ma/RIOT,brettswann/RIOT,BytesGalore/RIOT,watr-li/RIOT,Ell-i/RIOT,jfischer-phytec-iot/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,alignan/RIOT,kerneltask/RIOT,shady33/RIOT,Josar/RIOT,lazytech-org/RIOT,abp719/RIOT,mtausig/RIOT,koenning/RIOT,katezilla/RIOT,rfswarm/RIOT,beurdouche/RIOT,kerneltask/RIOT,altairpearl/RIOT,herrfz/RIOT-old,foss-for-synopsys-dwc-arc-processors/RIOT,ant9000/RIOT,neiljay/RIOT,ThanhVic/RIOT,basilfx/RIOT,rakendrathapa/RIOT,emmanuelsearch/RIOT,fnack/RIOT,dailab/RIOT,FrancescoErmini/RIOT,l3nko/RIOT,asanka-code/RIOT,MonsterCode8000/RIOT,sgso/RIOT,phiros/RIOT,thiagohd/RIOT,Osblouf/RIOT,herrfz/RIOT,latsku/RIOT,backenklee/RIOT,ximus/RIOT,watr-li/RIOT,miri64/RIOT,rakendrathapa/RIOT,adrianghc/RIOT,shady33/RIOT,wentaoshang/RIOT,beurdouche/RIOT,basilfx/RIOT,josephnoir/RIOT,malosek/RIOT,abp719/RIOT,adrianghc/RIOT,rousselk/RIOT,RIOT-OS/RIOT,rajma996/RIOT,neiljay/RIOT,A-Paul/RIOT,herrfz/RIOT-old,alignan/RIOT,JensErdmann/RIOT,sumanpanchal/RIOT,thomaseichinger/RIOT,fnack/RIOT,adrianghc/RIOT,fnack/RIOT,abkam07/RIOT,patkan/RIOT,jfischer-phytec-iot/RIOT,ThanhVic/RIOT,ximus/RIOT,ThanhVic/RIOT,neumodisch/RIOT,Hyungsin/RIOT-OS,jhollister/RIOT,abkam07/RIOT,jremmert-phytec-iot/RIOT,dhruvvyas90/RIOT,mfrey/RIOT,rajma996/RIOT,rfuentess/RIOT,toonst/RIOT,stevenj/RIOT,cladmi/RIOT,tdautc19841202/RIOT,kaleb-himes/RIOT,jremmert-phytec-iot/RIOT,robixnai/RIOT,RBartz/RIOT,authmillenon/RIOT,biboc/RIOT,watr-li/RIOT,biboc/RIOT,daniel-k/RIOT,rfswarm2/RIOT,zhuoshuguo/RIOT,JensErdmann/RIOT,jhollister/RIOT,neumodisch/RIOT,kaspar030/RIOT,ximus/RIOT,chris-wood/RIOT,ks156/RIOT,luciotorre/RIOT,emmanuelsearch/RIOT,mziegert/RIOT,koenning/RIOT,thiagohd/RIOT,automote/RIOT,BytesGalore/RIOT,jfischer-phytec-iot/RIOT,kaleb-himes/RIOT,msolters/RIOT,malosek/RIOT,emmanuelsearch/RIOT,MonsterCode8000/RIOT,sumanpanchal/RIOT,rfuentess/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Lexandro92/RIOT-CoAP,MarkXYang/RIOT,jremmert-phytec-iot/RIOT,biboc/RIOT,basilfx/RIOT,kushalsingh007/RIOT,Darredevil/RIOT,attdona/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,rfswarm/RIOT,yogo1212/RIOT,miri64/RIOT,haoyangyu/RIOT,thiagohd/RIOT,herrfz/RIOT-old,jhollister/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,koenning/RIOT,bartfaizoltan/RIOT,jbeyerstedt/RIOT-OTA-update,haoyangyu/RIOT,gbarnett/RIOT,alignan/RIOT,kb2ma/RIOT,MohmadAyman/RIOT,gbarnett/RIOT,abp719/RIOT,dkm/RIOT,tfar/RIOT,koenning/RIOT,rajma996/RIOT,backenklee/RIOT,marcosalm/RIOT,shady33/RIOT,asanka-code/RIOT,luciotorre/RIOT,MonsterCode8000/RIOT,Darredevil/RIOT,smlng/RIOT,zhuoshuguo/RIOT,neumodisch/RIOT,wentaoshang/RIOT,jferreir/RIOT,daniel-k/RIOT,binarylemon/RIOT,LudwigKnuepfer/RIOT,mfrey/RIOT,plushvoxel/RIOT,ant9000/RIOT,aeneby/RIOT,RBartz/RIOT,jasonatran/RIOT,jferreir/RIOT,immesys/RiSyn,x3ro/RIOT,mtausig/RIOT,ks156/RIOT,Lexandro92/RIOT-CoAP,fnack/RIOT,changbiao/RIOT,nsol-nmsu/RIOT,MarkXYang/RIOT,adjih/RIOT,luciotorre/RIOT,avmelnikoff/RIOT,rfswarm2/RIOT,RIOT-OS/RIOT,alex1818/RIOT,Yonezawa-T2/RIOT,aeneby/RIOT,arvindpdmn/RIOT,gautric/RIOT,gebart/RIOT,syin2/RIOT,AnonMall/RIOT,marcosalm/RIOT,rfswarm2/RIOT,nsol-nmsu/RIOT,PSHIVANI/Riot-Code,rfswarm/RIOT,zhuoshuguo/RIOT,herrfz/RIOT-old,Osblouf/RIOT,ThanhVic/RIOT,ThanhVic/RIOT,luciotorre/RIOT,adrianghc/RIOT,attdona/RIOT,alignan/RIOT,rakendrathapa/RIOT,tfar/RIOT,Darredevil/RIOT,OlegHahm/RIOT,smlng/RIOT,rousselk/RIOT,centurysys/RIOT,AnonMall/RIOT,stevenj/RIOT,FrancescoErmini/RIOT,Josar/RIOT,alex1818/RIOT,jhollister/RIOT,roberthartung/RIOT,1blankz7/RIOT,kaspar030/RIOT,Lexandro92/RIOT-CoAP,RBartz/RIOT,sumanpanchal/RIOT,x3ro/RIOT,authmillenon/RIOT,openkosmosorg/RIOT,mziegert/RIOT,JensErdmann/RIOT,lebrush/RIOT,MohmadAyman/RIOT,tfar/RIOT,A-Paul/RIOT,authmillenon/RIOT,dkm/RIOT,alex1818/RIOT,sumanpanchal/RIOT,JensErdmann/RIOT,patkan/RIOT,haoyangyu/RIOT,latsku/RIOT,gbarnett/RIOT,adjih/RIOT,dailab/RIOT,abkam07/RIOT,DipSwitch/RIOT,dkm/RIOT,altairpearl/RIOT