Clean up some inline documentation for emoji functionality, including a missing @since for mail_emoji(), and a changelog entry for wp_insert_post().

See #31242.


git-svn-id: https://develop.svn.wordpress.org/trunk@31789 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -435,12 +435,13 @@ function wp_default_scripts( &$scripts ) {
 		 * @param string The emoji base URL.
 		 */
 		'baseUrl' => apply_filters( 'emoji_url', '//s0.wp.com/wp-content/mu-plugins/emoji/twemoji/72x72' ),
+
 		/**
 		 * Filter the extension of the emoji files.
 		 *
 		 * @since 4.2.0
 		 *
-		 * @param string The emoji extension.
+		 * @param string The emoji extension. Default .png.
 		 */
 		'ext'      => apply_filters( 'emoji_ext', '.png' ),
 	) );