Remove phpcs exclusion rule MediaWiki.Commenting.PropertyDocumentation.MissingVar

Fix code to pass phpcs.

Change-Id: I093b87804d6b2c66efa6ba039d6f1e4720f30209

.phpcs.xml

@@ -1,8 +1,6 @@
 <?xml version="1.0"?>
 <ruleset>
-	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki">
-		<exclude name="MediaWiki.Commenting.PropertyDocumentation.MissingVar" />
-	</rule>
+	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki" />
 	<file>.</file>
 	<arg name="extensions" value="php" />
 	<arg name="encoding" value="UTF-8" />

includes/Hooks.php

@@ -51,15 +51,15 @@ class Hooks implements
 	ResourceLoaderGetConfigVarsHook,
 	ThumbnailBeforeProduceHTMLHook
 {
-	/** Link to more information about this module */
+	/** @var string Link to more information about this module */
 	protected static $infoLink =
 		'https://mediawiki.org/wiki/Special:MyLanguage/Extension:Media_Viewer/About';
 
-	/** Link to a page where this module can be discussed */
+	/** @var string Link to a page where this module can be discussed */
 	protected static $discussionLink =
 		'https://mediawiki.org/wiki/Special:MyLanguage/Extension_talk:Media_Viewer/About';
 
-	/** Link to help about this module */
+	/** @var string Link to help about this module */
 	protected static $helpLink =
 		'https://mediawiki.org/wiki/Special:MyLanguage/Help:Extension:Media_Viewer';