Merge branch 'wk/merge-options-gpg-sign-doc'

Doc updates. * wk/merge-options-gpg-sign-doc: Documentation/merge-options.txt: describe -S/--gpg-sign for 'pull'

Junio C Hamano committed Oct 19, 2017 at 14:45 UTC 9f8468be43df74665bfd9fd925d8ab6fc74f963f

No changes.