api/saml: add comments to describe saml callback
api/saml: add comments to describe saml callback

guilhermebr/tsuru,gwmoura/tsuru,guilhermebr/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,guilhermebr/tsuru,tsuru/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,ggarnier/tsuru,tsuru/tsuru,cezarsa/tsuru,cezarsa/tsuru,tsuru/tsuru,ggarnier/tsuru,gwmoura/tsuru,tsuru/tsuru