Docs: Add `@staticvar` entries for `get_html_split_regex()` and `_get_wptexturize_split_regex()`.

Props ajayghaghretiya1.
Fixes #41385.

git-svn-id: https://develop.svn.wordpress.org/trunk@41109 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -609,6 +609,8 @@ function wp_html_split( $input ) {
  *
  * @since 4.4.0
  *
+ * @staticvar string $regex
+ *
  * @return string The regular expression
  */
 function get_html_split_regex() {
@@ -666,6 +668,8 @@ function get_html_split_regex() {
  * @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
  * @since 4.4.0
  *
+ * @staticvar string $html_regex
+ *
  * @param string $shortcode_regex The result from _get_wptexturize_shortcode_regex().  Optional.
  * @return string The regular expression
  */