Update documentation re: building an index for Linux
Update documentation re: building an index for Linux

Reviewers: mazurak, schroederc, fromberger

Reviewed By: fromberger

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D397

kythe/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,kidaa/kythe,kythe/kythe,kidaa/kythe,bzz/kythe,bowlofstew/kythe,bowlofstew/kythe,bowlofstew/kythe,benjyw/kythe,bowlofstew/kythe,legrosbuffle/kythe,bowlofstew/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,legrosbuffle/kythe,bzz/kythe,legrosbuffle/kythe,kidaa/kythe,kythe/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,kidaa/kythe,kythe/kythe,legrosbuffle/kythe,bowlofstew/kythe,legrosbuffle/kythe,kidaa/kythe,bzz/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe,bzz/kythe,kidaa/kythe,bzz/kythe,kidaa/kythe,kythe/kythe,bowlofstew/kythe,benjyw/kythe,bzz/kythe,kidaa/kythe,benjyw/kythe,benjyw/kythe,bzz/kythe,bowlofstew/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,bowlofstew/kythe,benjyw/kythe,bowlofstew/kythe,bowlofstew/kythe,benjyw/kythe,benjyw/kythe,benjyw/kythe,kythe/kythe,bzz/kythe,kythe/kythe,benjyw/kythe,kidaa/kythe