Fix typo

lib/private/user/session.php

@@ -138,7 +138,7 @@ class Session implements IUserSession, Emitter {
 	}
 
 	/**
-	 * Checks wether the user is logged in
+	 * Checks whether the user is logged in
 	 *
 	 * @return bool if logged in
 	 */

lib/public/iusersession.php

@@ -66,7 +66,7 @@ interface IUserSession {
 	public function getUser();
 
 	/**
-	 * Checks wether the user is logged in
+	 * Checks whether the user is logged in
 	 *
 	 * @return bool if logged in
 	 */