maintenance: Fix detection of bad hooks (wfRunHooks -> Hooks::run)

maintenance: Fix detection of bad hooks (wfRunHooks -> Hooks::run)

It was still looking for wfRunHooks, which no longer exists
as of MediaWiki 1.32.

After this, it is now able to find one bad hook:

> Unclear hook calls:
> - Hooks::run( $action . 'ArticleComplete', [ .. ] ); # SpecialEditWatchlist

Also, remove the matching of wfRunHooks generally, given it no
longer exists. And also remove the historic notes from hooks.txt.

Change-Id: I4ac52ed75fb99d7775d4b4755e3f0871003d70a8