D19384: extend documentation of kpackage_install_bundled_package

[Harald Sitter]

sitter added a dependency: D19383: remove kpackage_install_package deprecation 
warning.

REPOSITORY
  R290 KPackage

REVISION DETAIL
  https://phabricator.kde.org/D19384

To: sitter, mart
Cc: kde-frameworks-devel, michaelh, ngraham, bruns