minor doc fixes
minor doc fixes

Reviewers: tedks, scpayson, collinwinter

Reviewed By: collinwinter

Differential Revision: https://phabricator-dot-shipshapecode.appspot.com/D161

google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape