Docs: Convert `@see` reference in `wp_checkdate()` DocBlock to `@link`.

Props WiZZarD_.
Merges [43599] to the 4.9 branch.
Fixes #44866.
Built from https://develop.svn.wordpress.org/branches/4.9@43610


git-svn-id: http://core.svn.wordpress.org/branches/4.9@43439 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -5244,7 +5244,7 @@ function wp_is_stream( $path ) {
  *
  * @since 3.5.0
  *
- * @see checkdate()
+ * @link https://secure.php.net/manual/en/function.checkdate.php
  *
  * @param  int    $month       Month number.
  * @param  int    $day         Day number.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.9-alpha-43607';
+$wp_version = '4.9.9-alpha-43610';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.