Docs: Fix types for wp_cache_set_last_changed filter.

Corrects the type for the `$time` and `$previous_time` parameters in the filter to indicate the times are expressed as strings. The values are generated from a call to `microtime()` which returns the time as a string in the form `msec sec`.

Props tillkruess, westonruter.
Fixes #63194.




git-svn-id: https://develop.svn.wordpress.org/trunk@60128 602fd350-edb4-49c9-b593-d223f7449a82

Author: peterwilsoncc

src/wp-includes/functions.php

@@ -8069,9 +8069,9 @@ function wp_cache_set_last_changed( $group ) {
 	 *
 	 * @since 6.3.0
 	 *
-	 * @param string    $group         The cache group name.
-	 * @param int       $time          The new last changed time.
-	 * @param int|false $previous_time The previous last changed time. False if not previously set.
+	 * @param string       $group         The cache group name.
+	 * @param string       $time          The new last changed time (msec sec).
+	 * @param string|false $previous_time The previous last changed time. False if not previously set.
 	 */
 	do_action( 'wp_cache_set_last_changed', $group, $time, $previous_time );