Updated mediawiki/extensions
Project: mediawiki/extensions/SemanticMediaWiki  ed852f3dbcef32de6054ecb7ef2e61c90b31d789

Add and update hooks documentation

Maintaining hooks documentation on-wiki will eventually be outdated therefore
moving it where it belongs.

Change-Id: Ia3159a6a2eb65782f79ef9735e8c22f7243e497f