docs/building: add doxygen information
docs/building: add doxygen information

Also Sphinx version

Signed-off-by: Thomas Ingleby <cea8b9d820e871fd22532c955ca84ff867a004a3@intel.com>

timrtoo/Intel,neuberfran/mraa,g-vidal/mraa,stefan-andritoiu/mraa,alex1818/mraa,jontrulson/mraa,stefan-andritoiu/mraa,neuberfran/mraa,jontrulson/mraa,zBMNForks/mraa,neuroidss/mraa,alexandru-elisei/mraa,Propanu/mraa,anonymouse64/mraa,allela-roy/mraa,sundw2014/mraa,noahchense/mraa,Meirtz/mraa,alexandru-elisei/mraa,allela-roy/mraa,intel-iot-devkit/mraa,matt-auld/mraa,stefan-andritoiu/mraa-gpio-chardev,w4ilun/mraa,KurtE/mraa,andreivasiliu2211/mraa,ProfFan/mraa,zBMNForks/mraa,spitfire88/mraa,whbruce/mraa,Pillar1989/mraa,timrtoo/Intel,neuroidss/mraa,ProfFan/mraa,KurtE/mraa,noahchense/mraa,stefan-andritoiu/mraa-gpio-chardev,Propanu/mraa,pctj101/mraa,intel-iot-devkit/mraa,g-vidal/mraa,smileboywtu/mraa,mircea/mraa,Hbrinj/mraa,STANAPO/mraa,petreeftime/mraa,pctj101/mraa,alext-mkrs/mraa,arunlee77/mraa,yoyojacky/mraa,seem-sky/mraa,arunlee77/mraa,petreeftime/mraa,jontrulson/mraa,timrtoo/Intel,smileboywtu/mraa,Propanu/mraa,SyrianSpock/mraa,tripzero/mraa,allela-roy/mraa,pctj101/mraa,malikabhi05/mraa,neuroidss/mraa,arfoll/mraa,malikabhi05/mraa,Hbrinj/mraa,andreivasiliu2211/mraa,andreivasiliu2211/mraa,jontrulson/mraa,STANAPO/mraa,malikabhi05/mraa,intel-iot-devkit/mraa,g-vidal/mraa,stefan-andritoiu/mraa,stefan-andritoiu/mraa,g-vidal/mraa,sergev/mraa,neuberfran/mraa,w4ilun/mraa,anonymouse64/mraa,neuberfran/mraa,damcclos/mraa,arfoll/mraa,Kiritoalex/mraa,alext-mkrs/mraa,sergev/mraa,whbruce/mraa,alext-mkrs/mraa,STANAPO/mraa,yongli3/mraa,alexandru-elisei/mraa,arfoll/mraa,seem-sky/mraa,damcclos/mraa,alexandru-elisei/mraa,sergev/mraa,noahchense/mraa,Kiritoalex/mraa,damcclos/mraa,sergev/mraa,spitfire88/mraa,arunlee77/mraa,seem-sky/mraa,Kiritoalex/mraa,nioinnovation/mraa,sundw2014/mraa,nioinnovation/mraa,yongli3/mraa,ncrastanaren/mraa,intel-iot-devkit/mraa,sundw2014/mraa,whbruce/mraa,Meirtz/mraa,malikabhi05/mraa,ncrastanaren/mraa,Pillar1989/mraa,noahchense/mraa,Hbrinj/mraa,ProfFan/mraa,alex1818/mraa,Jon-ICS/mraa,Pillar1989/mraa,Propanu/mraa,w4ilun/mraa,stefan-andritoiu/mraa-gpio-chardev,petreeftime/mraa,timrtoo/Intel,arunlee77/mraa,Jon-ICS/mraa,smileboywtu/mraa,intel-iot-devkit/mraa,g-vidal/mraa,spitfire88/mraa,Propanu/mraa,pctj101/mraa,matt-auld/mraa,neuberfran/mraa,timrtoo/Intel,yoyojacky/mraa,sergev/mraa,alext-mkrs/mraa,seem-sky/mraa,stefan-andritoiu/mraa-gpio-chardev,alex1818/mraa,petreeftime/mraa,sundw2014/mraa,yongli3/mraa,pctj101/mraa,SyrianSpock/mraa,stefan-andritoiu/mraa-gpio-chardev,yoyojacky/mraa,seem-sky/mraa,malikabhi05/mraa,yongli3/mraa,sundw2014/mraa,jontrulson/mraa,tripzero/mraa,andreivasiliu2211/mraa,KurtE/mraa,Jon-ICS/mraa,nioinnovation/mraa,alext-mkrs/mraa,arfoll/mraa,noahchense/mraa,alexandru-elisei/mraa,KurtE/mraa,spitfire88/mraa,SyrianSpock/mraa,ProfFan/mraa,stefan-andritoiu/mraa,w4ilun/mraa,zBMNForks/mraa,mircea/mraa,mircea/mraa,ncrastanaren/mraa,Meirtz/mraa,whbruce/mraa,Hbrinj/mraa,KurtE/mraa,arfoll/mraa,anonymouse64/mraa,matt-auld/mraa,tripzero/mraa,ncrastanaren/mraa,yongli3/mraa,ncrastanaren/mraa