netdev2: make doc for driver more precise
netdev2: make doc for driver more precise

When working on #6121 I noticed that the documentation of the `netdev2`
driver part is not really precise. This fixes that.

thomaseichinger/RIOT,kerneltask/RIOT,gautric/RIOT,roberthartung/RIOT,basilfx/RIOT,roberthartung/RIOT,hamilton-mote/RIOT-OS,alignan/RIOT,gautric/RIOT,jasonatran/RIOT,plushvoxel/RIOT,ant9000/RIOT,OlegHahm/RIOT,LudwigKnuepfer/RIOT,miri64/RIOT,kYc0o/RIOT,beurdouche/RIOT,dkm/RIOT,yogo1212/RIOT,adjih/RIOT,kaleb-himes/RIOT,Josar/RIOT,gautric/RIOT,biboc/RIOT,kYc0o/RIOT,tfar/RIOT,miri64/RIOT,neumodisch/RIOT,gautric/RIOT,neumodisch/RIOT,josephnoir/RIOT,josephnoir/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,backenklee/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,basilfx/RIOT,katezilla/RIOT,jfischer-phytec-iot/RIOT,hamilton-mote/RIOT-OS,kb2ma/RIOT,rfuentess/RIOT,josephnoir/RIOT,mtausig/RIOT,avmelnikoff/RIOT,kYc0o/RIOT,beurdouche/RIOT,aeneby/RIOT,neiljay/RIOT,toonst/RIOT,Hyungsin/RIOT-OS,kb2ma/RIOT,lazytech-org/RIOT,cladmi/RIOT,kerneltask/RIOT,avmelnikoff/RIOT,tfar/RIOT,basilfx/RIOT,mfrey/RIOT,miri64/RIOT,avmelnikoff/RIOT,beurdouche/RIOT,TobiasFredersdorf/RIOT,kerneltask/RIOT,jbeyerstedt/RIOT-OTA-update,TobiasFredersdorf/RIOT,basilfx/RIOT,lazytech-org/RIOT,A-Paul/RIOT,hamilton-mote/RIOT-OS,thomaseichinger/RIOT,kaleb-himes/RIOT,cladmi/RIOT,jbeyerstedt/RIOT-OTA-update,kaspar030/RIOT,syin2/RIOT,Josar/RIOT,rfuentess/RIOT,yogo1212/RIOT,Josar/RIOT,alignan/RIOT,neiljay/RIOT,kb2ma/RIOT,smlng/RIOT,kerneltask/RIOT,gebart/RIOT,gebart/RIOT,BytesGalore/RIOT,dailab/RIOT,mfrey/RIOT,dkm/RIOT,ant9000/RIOT,neumodisch/RIOT,roberthartung/RIOT,authmillenon/RIOT,TobiasFredersdorf/RIOT,Josar/RIOT,kb2ma/RIOT,backenklee/RIOT,x3ro/RIOT,immesys/RiSyn,aeneby/RIOT,RIOT-OS/RIOT,syin2/RIOT,plushvoxel/RIOT,ant9000/RIOT,yogo1212/RIOT,dkm/RIOT,immesys/RiSyn,Josar/RIOT,syin2/RIOT,cladmi/RIOT,OlegHahm/RIOT,katezilla/RIOT,kaspar030/RIOT,OTAkeys/RIOT,Ell-i/RIOT,miri64/RIOT,thomaseichinger/RIOT,OTAkeys/RIOT,toonst/RIOT,neumodisch/RIOT,OTAkeys/RIOT,jfischer-phytec-iot/RIOT,thomaseichinger/RIOT,adrianghc/RIOT,kaleb-himes/RIOT,lazytech-org/RIOT,tfar/RIOT,BytesGalore/RIOT,biboc/RIOT,tfar/RIOT,mtausig/RIOT,RIOT-OS/RIOT,dkm/RIOT,adrianghc/RIOT,aeneby/RIOT,toonst/RIOT,mfrey/RIOT,ks156/RIOT,LudwigOrtmann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,LudwigOrtmann/RIOT,kaleb-himes/RIOT,mtausig/RIOT,adjih/RIOT,adjih/RIOT,toonst/RIOT,basilfx/RIOT,Ell-i/RIOT,adrianghc/RIOT,kYc0o/RIOT,katezilla/RIOT,mfrey/RIOT,LudwigKnuepfer/RIOT,x3ro/RIOT,neiljay/RIOT,OlegHahm/RIOT,kaspar030/RIOT,authmillenon/RIOT,gautric/RIOT,x3ro/RIOT,immesys/RiSyn,dkm/RIOT,biboc/RIOT,toonst/RIOT,aeneby/RIOT,rfuentess/RIOT,alignan/RIOT,thomaseichinger/RIOT,katezilla/RIOT,authmillenon/RIOT,jfischer-phytec-iot/RIOT,Ell-i/RIOT,ks156/RIOT,hamilton-mote/RIOT-OS,plushvoxel/RIOT,ks156/RIOT,jasonatran/RIOT,gebart/RIOT,syin2/RIOT,kbumsik/RIOT,beurdouche/RIOT,alignan/RIOT,A-Paul/RIOT,Ell-i/RIOT,OlegHahm/RIOT,rfuentess/RIOT,smlng/RIOT,A-Paul/RIOT,backenklee/RIOT,mtausig/RIOT,jbeyerstedt/RIOT-OTA-update,BytesGalore/RIOT,BytesGalore/RIOT,x3ro/RIOT,immesys/RiSyn,josephnoir/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Hyungsin/RIOT-OS,Hyungsin/RIOT-OS,jasonatran/RIOT,jbeyerstedt/RIOT-OTA-update,mfrey/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,BytesGalore/RIOT,jfischer-phytec-iot/RIOT,yogo1212/RIOT,kaspar030/RIOT,A-Paul/RIOT,RIOT-OS/RIOT,immesys/RiSyn,beurdouche/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,biboc/RIOT,kYc0o/RIOT,hamilton-mote/RIOT-OS,katezilla/RIOT,smlng/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,Ell-i/RIOT,backenklee/RIOT,plushvoxel/RIOT,gebart/RIOT,backenklee/RIOT,LudwigKnuepfer/RIOT,alignan/RIOT,TobiasFredersdorf/RIOT,LudwigKnuepfer/RIOT,josephnoir/RIOT,ant9000/RIOT,Hyungsin/RIOT-OS,mtausig/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ks156/RIOT,kbumsik/RIOT,yogo1212/RIOT,smlng/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,aeneby/RIOT,ks156/RIOT,smlng/RIOT,adrianghc/RIOT,dailab/RIOT,LudwigOrtmann/RIOT,authmillenon/RIOT,roberthartung/RIOT,neiljay/RIOT,kbumsik/RIOT,authmillenon/RIOT,TobiasFredersdorf/RIOT,dailab/RIOT,cladmi/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,cladmi/RIOT,kbumsik/RIOT,immesys/RiSyn,yogo1212/RIOT,rfuentess/RIOT,roberthartung/RIOT,kb2ma/RIOT,kerneltask/RIOT,authmillenon/RIOT,neumodisch/RIOT,miri64/RIOT,kbumsik/RIOT,adjih/RIOT,dailab/RIOT,dailab/RIOT,avmelnikoff/RIOT,x3ro/RIOT,OlegHahm/RIOT,Hyungsin/RIOT-OS,adrianghc/RIOT,biboc/RIOT,kaleb-himes/RIOT,jbeyerstedt/RIOT-OTA-update,ant9000/RIOT,syin2/RIOT,kaspar030/RIOT,gebart/RIOT,LudwigKnuepfer/RIOT,LudwigOrtmann/RIOT,neumodisch/RIOT,jfischer-phytec-iot/RIOT,adjih/RIOT,avmelnikoff/RIOT,plushvoxel/RIOT,neiljay/RIOT,A-Paul/RIOT,tfar/RIOT