Fix mw.org link for PageContentSaveComplete link
Fix mw.org link for PageContentSaveComplete link

Seems I forgot to update it

Change-Id: I56ddd5488e6893e834abc1402120c072e8c309fc

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo