D25312: Document configuration file path on Android

[Jonah Brüchert]

jbbgameich added a reviewer: vkrause.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D25312

To: jbbgameich, vkrause
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns