Docs: remove global references to $wp_version that are no longer accurate.

This commit cleans up a few `global $wp_version` doc-block entries for functions that switched to using `wp_get_wp_version()` in 6.7.

Follow up to [58848], [59192].

Props viralsampat.

Fixes #63732.

git-svn-id: https://develop.svn.wordpress.org/trunk@60493 602fd350-edb4-49c9-b593-d223f7449a82

Author: JJJ

src/wp-includes/update.php

@@ -21,7 +21,6 @@
  *
  * @since 2.3.0
  *
- * @global string $wp_version       Used to check against the newest WordPress version.
  * @global wpdb   $wpdb             WordPress database abstraction object.
  * @global string $wp_local_package Locale code of the package.
  *
@@ -317,8 +316,6 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
  *
  * @since 2.3.0
  *
- * @global string $wp_version The WordPress version string.
- *
  * @param array $extra_stats Extra statistics to report to the WordPress.org API.
  */
 function wp_update_plugins( $extra_stats = array() ) {
@@ -590,8 +587,6 @@ function wp_update_plugins( $extra_stats = array() ) {
  *
  * @since 2.7.0
  *
- * @global string $wp_version The WordPress version string.
- *
  * @param array $extra_stats Extra statistics to report to the WordPress.org API.
  */
 function wp_update_themes( $extra_stats = array() ) {