Docs: Correct @return type for calendar_week_mod().

Props dingo_bastard.
Fixes #40077.

git-svn-id: https://develop.svn.wordpress.org/trunk@40254 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/general-template.php

@@ -1860,7 +1860,7 @@ function wp_get_archives( $args = '' ) {
  * @since 1.5.0
  *
  * @param int $num Number of day.
- * @return int Days since the start of the week.
+ * @return float Days since the start of the week.
  */
 function calendar_week_mod($num) {
 	$base = 7;