Add missing documentation to class properties

Add doc-typehints to class properties found by the PropertyDocumentation
sniff to improve the documentation and to remove the exclusion of the
sniff.
The activated sniff avoids that new code is missing doc-typehints or
real-typehints.

Adding a @var type to RSSData->items triggers a SecurityCheck-XSS issue by phan, but all is dealing with wikitext when building the items, so that looks like a false positive

Change-Id: I4f1d17372d62f02fe7447f5bf5e75b9471d7a338

.phpcs.xml

@@ -2,8 +2,6 @@
 <ruleset>
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki">
 		<exclude name="MediaWiki.Commenting.FunctionComment.MissingDocumentationPrivate" />
-		<exclude name="MediaWiki.Commenting.PropertyDocumentation.MissingDocumentationProtected" />
-		<exclude name="MediaWiki.Commenting.PropertyDocumentation.MissingDocumentationPublic" />
 	</rule>
 	<file>.</file>
 	<arg name="extensions" value="php" />

includes/Hooks.php

@@ -98,6 +98,7 @@ class Hooks implements ParserFirstCallInitHook {
 			return Utils::getErrorHtml( 'rss-empty', htmlspecialchars( $input ) );
 		}
 
+		// @phan-suppress-next-line SecurityCheck-XSS
 		return $rss->renderFeed( $parser, $frame );
 	}
 

includes/RSSData.php

@@ -6,7 +6,9 @@ use DOMDocument;
 use DOMXPath;
 
 class RSSData {
+	/** @var string */
 	public $error;
+	/** @var string[][] */
 	public $items;
 
 	/**

includes/RSSParser.php

@@ -16,20 +16,35 @@ use WANObjectCache;
 use Wikimedia\AtEase\AtEase;
 
 class RSSParser {
+	/** @var int */
 	protected $maxheads = 32;
+	/** @var string */
 	protected $date = "Y-m-d H:i:s";
+	/** @var int */
 	protected $ItemMaxLength = 200;
+	/** @var bool */
 	protected $reversed = false;
+	/** @var string[] */
 	protected $highlight = [];
+	/** @var string[] */
 	protected $filter = [];
+	/** @var string[] */
 	protected $filterOut = [];
+	/** @var string */
 	protected $itemTemplate;
+	/** @var string */
 	protected $url;
+	/** @var string */
 	protected $etag;
+	/** @var int */
 	protected $lastModified;
+	/** @var DOMDocument */
 	protected $xml;
+	/** @var string[] */
 	protected $displayFields = [ 'author', 'title', 'encodedContent', 'description' ];
+	/** @var string[] */
 	protected $stripItems;
+	/** @var string */
 	protected $markerString;
 
 	/**