Copyedit docs for group-level secret variables
Copyedit docs for group-level secret variables

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