Fix parameter description formatting in post.php

Corrected formatting of the parameter description for clarity.

Author: westonruter

src/wp-includes/post.php

@@ -1135,7 +1135,7 @@ function get_extended( $post ) {
  *
  * @global WP_Post $post Global post object.
  *
- * @param int|object|null $post  c  Optional. Post ID or post object. `null`, `false`, `0` and other PHP falsey values
+ * @param int|object|null $post    Optional. Post ID or post object. `null`, `false`, `0` and other PHP falsey values
  *                                 return the current global post inside the loop. A numerically valid post ID that
  *                                 points to a non-existent post returns `null`. Defaults to global $post.
  * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which