Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  6efc8c42b85f5c9ddcad6e3c3019196d6e6053a0

Documentation: Clarify ReferenceClarifier API

The $from and $to parameters call a method that requires them to
be Title instances, so put that into the getWhatLinksHereProps
function signature to make it clear.

Change-Id: If0844d68968ea35c4dbc710e4e1bc55198c761b4