D13072: add info about default/custom annotations

[Yuri Chornoivan]

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

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D13072

To: lueck, #okular, #documentation, yurchor
Cc: okular-devel, kde-doc-english, ngraham, skadinna, aacid
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