D5517: update kmail documentation (index.docbook)

[Laurent Montel]

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

REPOSITORY
  R206 KMail

REVISION DETAIL
  https://phabricator.kde.org/D5517

To: lueck, #kde_pim, mlaurent, #documentation
Cc: dvasin, ach, winterz, vkrause, mlaurent, knauss, dvratil
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