Coding Standards: Rename the $expires_offset variable in `cache_jav…

…ascript_headers()`.

This resolves a WPCS warning:
{{{
Variable "$expiresOffset" is not in valid snake_case format, try "$expires_offset"
}}}

Follow-up to [4109], [21996].

See #59650.

git-svn-id: https://develop.svn.wordpress.org/trunk@57532 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -1548,11 +1548,11 @@ function nocache_headers() {
  * @since 2.1.0
  */
 function cache_javascript_headers() {
-	$expiresOffset = 10 * DAY_IN_SECONDS;
+	$expires_offset = 10 * DAY_IN_SECONDS;
 
 	header( 'Content-Type: text/javascript; charset=' . get_bloginfo( 'charset' ) );
 	header( 'Vary: Accept-Encoding' ); // Handle proxies.
-	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expiresOffset ) . ' GMT' );
+	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expires_offset ) . ' GMT' );
 }
 
 /**