D21271: Improve documentation of TextEntity stuff

[Albert Astals Cid]

aacid closed this revision.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D21271

To: davidhurka, #okular, aacid
Cc: aacid, yurchor, okular-devel, maguirre, fbampaloukas, joaonetto, kezik, 
tfella, ngraham, darcyshen