pkg/openthread: fix typo in documentation
pkg/openthread: fix typo in documentation

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