D18913: ECMGeneratePkgConfigFile API dox: fix "Since" for DESCRIPTION arg

[Christophe Giboudeaux]

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

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  fixsincelocationfordescription

REVISION DETAIL
  https://phabricator.kde.org/D18913

To: kossebau, cgiboudeaux
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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