Remove incorrect code comment

This was copy-pasted from the function above and it is not true here.

Change-Id: I0513d46789405ea2e6d1cdb619cc548ab8e9ef2b

includes/skins/SkinMinerva.php

@@ -1229,9 +1229,6 @@ class SkinMinerva extends SkinTemplate implements ICustomizableSkin {
 	/**
 	 * Checks whether the editor can handle the existing content handler type.
 	 *
-	 * This is mostly the same check that sets wgIsProbablyEditable later in the page output
-	 * process.
-	 *
 	 * @return bool
 	 */
 	protected function isCurrentPageContentModelEditable() {