Editor: Correct the description of the parameter passed to the `wp_default_editor` filter.

Props goto10
Fixes #38327


git-svn-id: https://develop.svn.wordpress.org/trunk@39074 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/general-template.php

@@ -3018,7 +3018,8 @@ function wp_default_editor() {
 	 *
 	 * @since 2.5.0
 	 *
-	 * @param array $r An array of editors. Accepts 'tinymce', 'html', 'test'.
+	 * @param string $r string Which editor should be displayed by default. Either 'tinymce',
+	 *                         'html', or 'test'
 	 */
 	return apply_filters( 'wp_default_editor', $r );
 }