KConfig: Assign documentation to correct enum value

Summary:
In commit 8579ec54 (D13034), the Notify value got introduced in
enum WriteConfigFlag in KConfigBase. When adding this new value,
the value and its documentation (Doxygen format, /**<) got placed
wrongly.
After commit 8579ec54, the documentation for Notify "documents"
the previously existing value Localized, whereas the documentation
for Localized documents Notify.
Simply exchanging the order of the documentation comments fixes
this issue.

Reviewers: broulik, dfaure, davidedmundson

Reviewed By: davidedmundson

Subscribers: kde-frameworks-devel

Tags: documentation, frameworks

Differential Revision: https://phabricator.kde.org/D19320