examples/gnrc_networking: fix comments
examples/gnrc_networking: fix comments

As the lines refered to in the comments are already commented out,
the correct thing to do to use them is to uncomment them.

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