Docs: Various corrections to inline docblocks.

See #49572

git-svn-id: https://develop.svn.wordpress.org/trunk@48573 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post-template.php

@@ -1544,6 +1544,7 @@ function walk_page_tree( $pages, $depth, $current_page, $r ) {
  * @uses Walker_PageDropdown to create HTML dropdown content.
  * @see Walker_PageDropdown::walk() for parameters and return description.
  *
+ * @param mixed ...$args Elements array, maximum hierarchical depth and optional additional arguments.
  * @return string
  */
 function walk_page_dropdown_tree( ...$args ) {