Added $res var docs for RevisionListBase

Change-Id: Ib71b9c662e68b64f1c6ad07c1902ed8ed432f175

includes/RevisionList.php

@@ -30,6 +30,7 @@ abstract class RevisionListBase extends ContextSource {
 	/** @var array */
 	protected $ids;
 
+	/** @var ResultWrapper|bool */
 	protected $res;
 
 	/** @var bool|object */

includes/revisiondelete/RevDelList.php

@@ -92,7 +92,9 @@ abstract class RevDelList extends RevisionListBase {
 		$this->res = false;
 		$dbw = wfGetDB( DB_MASTER );
 		$this->doQuery( $dbw );
+
 		$dbw->startAtomic( __METHOD__ );
+
 		$status = Status::newGood();
 		$missing = array_flip( $this->ids );
 		$this->clearFileOps();