fix gfm doc typo about two spaces for next line transfer
fix gfm doc typo about two spaces for next line transfer

mmkassem/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,iiet/iiet-git,jirutka/gitlabhq,darkrasid/gitlabhq,LUMC/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,openwide-java/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,htve/GitlabForChinese,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,dreampet/gitlab,htve/GitlabForChinese,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,dplarson/gitlabhq,openwide-java/gitlabhq,dplarson/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,openwide-java/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq