Docs: Remove unused @global reference in do_blocks() DocBlock.

Props avinapatel.
Fixes #47055.

git-svn-id: https://develop.svn.wordpress.org/trunk@45393 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks.php

@@ -301,9 +301,8 @@ function parse_blocks( $content ) {
  * Parses dynamic blocks out of `post_content` and re-renders them.
  *
  * @since 5.0.0
- * @global WP_Post $post The post to edit.
  *
- * @param  string $content Post content.
+ * @param string $content Post content.
  * @return string Updated post content.
  */
 function do_blocks( $content ) {