Replace hard-deprecated WikiPage::getRevision call in generateSampleNotifications.php
Replace hard-deprecated WikiPage::getRevision call in generateSampleNotifications.php

...but keep soft-deprecated WikiPage::doEditContent because no realistic
replacement exists :/

Change-Id: Iee8c2fcfcbd5cb8c15854b1ada9eb691a2197658

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