removes unnecessary redundacy in usage ping doc
removes unnecessary redundacy in usage ping doc

iiet/iiet-git,stoplightio/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,dplarson/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,jirutka/gitlabhq,t-zuehlsdorff/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,iiet/iiet-git