gnrc_sixlowpan: update gnrc_netapi doc
gnrc_sixlowpan: update gnrc_netapi doc

x3ro/RIOT,basilfx/RIOT,BytesGalore/RIOT,mtausig/RIOT,toonst/RIOT,mfrey/RIOT,miri64/RIOT,miri64/RIOT,OTAkeys/RIOT,mfrey/RIOT,A-Paul/RIOT,toonst/RIOT,miri64/RIOT,smlng/RIOT,kYc0o/RIOT,kaspar030/RIOT,kYc0o/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,cladmi/RIOT,kYc0o/RIOT,OTAkeys/RIOT,miri64/RIOT,lazytech-org/RIOT,BytesGalore/RIOT,toonst/RIOT,x3ro/RIOT,kaspar030/RIOT,ant9000/RIOT,yogo1212/RIOT,aeneby/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,miri64/RIOT,toonst/RIOT,lazytech-org/RIOT,smlng/RIOT,kYc0o/RIOT,ant9000/RIOT,rfuentess/RIOT,lazytech-org/RIOT,mfrey/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,aeneby/RIOT,yogo1212/RIOT,kaspar030/RIOT,kaspar030/RIOT,basilfx/RIOT,mfrey/RIOT,jasonatran/RIOT,jasonatran/RIOT,yogo1212/RIOT,OlegHahm/RIOT,ant9000/RIOT,A-Paul/RIOT,BytesGalore/RIOT,A-Paul/RIOT,A-Paul/RIOT,OlegHahm/RIOT,basilfx/RIOT,cladmi/RIOT,rfuentess/RIOT,yogo1212/RIOT,OTAkeys/RIOT,BytesGalore/RIOT,BytesGalore/RIOT,authmillenon/RIOT,OlegHahm/RIOT,toonst/RIOT,aeneby/RIOT,jasonatran/RIOT,mfrey/RIOT,A-Paul/RIOT,aeneby/RIOT,jasonatran/RIOT,cladmi/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,basilfx/RIOT,josephnoir/RIOT,smlng/RIOT,rfuentess/RIOT,x3ro/RIOT,cladmi/RIOT,OTAkeys/RIOT,authmillenon/RIOT,authmillenon/RIOT,authmillenon/RIOT,OlegHahm/RIOT,basilfx/RIOT,josephnoir/RIOT,lazytech-org/RIOT,mtausig/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,josephnoir/RIOT,cladmi/RIOT,ant9000/RIOT,aeneby/RIOT,ant9000/RIOT,x3ro/RIOT,x3ro/RIOT,smlng/RIOT,mtausig/RIOT,smlng/RIOT,josephnoir/RIOT,mtausig/RIOT,mtausig/RIOT,rfuentess/RIOT,lazytech-org/RIOT,yogo1212/RIOT,authmillenon/RIOT,josephnoir/RIOT,yogo1212/RIOT,kYc0o/RIOT