D12062: Slightly update the docs, add configuration section

[Yuri Chornoivan]

yurchor marked an inline comment as done.

REPOSITORY
  R260 Gwenview

REVISION DETAIL
  https://phabricator.kde.org/D12062

To: yurchor, #gwenview, #documentation, rkflx
Cc: rkflx, ngraham, kde-doc-english
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