Add BroadcastMessage API documentation
Add BroadcastMessage API documentation

shinexiao/gitlabhq,LUMC/gitlabhq,darkrasid/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,daiyu/gitlab-zh,iiet/iiet-git,allysonbarros/gitlabhq,darkrasid/gitlabhq,allysonbarros/gitlabhq,mmkassem/gitlabhq,allysonbarros/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,icedwater/gitlabhq,screenpages/gitlabhq,darkrasid/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,shinexiao/gitlabhq,iiet/iiet-git,openwide-java/gitlabhq,icedwater/gitlabhq,mmkassem/gitlabhq,icedwater/gitlabhq,darkrasid/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,htve/GitlabForChinese,daiyu/gitlab-zh,shinexiao/gitlabhq,openwide-java/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,jirutka/gitlabhq,shinexiao/gitlabhq,mmkassem/gitlabhq,dplarson/gitlabhq,openwide-java/gitlabhq,icedwater/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,SVArago/gitlabhq,screenpages/gitlabhq,LUMC/gitlabhq,SVArago/gitlabhq,htve/GitlabForChinese,screenpages/gitlabhq,SVArago/gitlabhq,iiet/iiet-git,htve/GitlabForChinese,SVArago/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,allysonbarros/gitlabhq,screenpages/gitlabhq,openwide-java/gitlabhq,LUMC/gitlabhq,daiyu/gitlab-zh,stoplightio/gitlabhq,daiyu/gitlab-zh,stoplightio/gitlabhq