Administration: Fix typos in wp_admin_notice() arguments in a few instances.

Follow-up to [56570], [56599].

Props dlh, mukesh27, sumitbagthariya16.
Fixes #59830.

git-svn-id: https://develop.svn.wordpress.org/trunk@57084 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/theme-editor.php

@@ -195,7 +195,7 @@ if ( isset( $_GET['a'] ) ) {
 		__( 'File edited successfully.' ),
 		array(
 			'id'                 => 'message',
-			'is-dismissible'     => true,
+			'dismissible'        => true,
 			'additional_classes' => array( 'updated' ),
 		)
 	);