Docs: Correct @return type for get_post_field().

Follow-up to [6379], [21559], [24490].

Props marian1, rollybueno.
Fixes #63802.

git-svn-id: https://develop.svn.wordpress.org/trunk@60621 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/post.php

@@ -1180,7 +1180,7 @@ function get_post_ancestors( $post ) {
  * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to global $post.
  * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
  *                             or 'display'. Default 'display'.
- * @return string The value of the post field on success, empty string on failure.
+ * @return int|string|int[] The value of the post field on success, empty string on failure.
  */
 function get_post_field( $field, $post = null, $context = 'display' ) {
 	$post = get_post( $post );