Docs: Improve @return docblock section for get_category().

This changeset adds more details on the `WP_Term` returned by `get_category()` as it contains additional backwards compatible aliases for the era before WP 4.4 and 2.3.

Props apermo, audrasjb.
Fixes #62842.
See #62281.




git-svn-id: https://develop.svn.wordpress.org/trunk@59704 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-includes/category.php

@@ -85,8 +85,9 @@ function get_categories( $args = '' ) {
  *                             correspond to a WP_Term object, an associative array, or a numeric array,
  *                             respectively. Default OBJECT.
  * @param string     $filter   Optional. How to sanitize category fields. Default 'raw'.
- * @return object|array|WP_Error|null Category data in type defined by $output parameter.
- *                                    WP_Error if $category is empty, null if it does not exist.
+ * @return WP_Term|array|WP_Error|null Category data in type defined by $output parameter.
+ *                                     Returns a WP_Term object with backwards compatible property aliases filled in.
+ *                                     WP_Error if $category is empty, null if it does not exist.
  */
 function get_category( $category, $output = OBJECT, $filter = 'raw' ) {
 	$category = get_term( $category, 'category', $output, $filter );