D8263: Mention the share menu in the documentation

[Yuri Chornoivan]

yurchor accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D8263

To: ervin, aacid, kde-doc-english, yurchor
Cc: #okular, aacid