IGroup::getDisplayName is available version 12, not 11 (9.2)

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/public/IGroup.php

@@ -41,7 +41,7 @@ interface IGroup {
 	 * Returns the group display name
 	 *
 	 * @return string
-	 * @since 9.2
+	 * @since 12.0.0
 	 */
 	public function getDisplayName();