Taxonomy: Restore documentation for the `taxonomy` parameter of `wp_list_categories()`.

The parameter's default value is different from the one in `WP_Term_Query::__construct()`, and should be documented accordingly.

This also clarifies that the `taxonomy` parameter of `wp_list_categories()` only accepts a string, not an array.

Follow-up to [40903], [41767], [45894], [45895].

Props grapplerulrich, mukesh27, TimothyBlynJacobs, SergeyBiryukov.
Fixes #51378. See #47896.
Built from https://develop.svn.wordpress.org/trunk@49060


git-svn-id: http://core.svn.wordpress.org/trunk@48822 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/category-template.php

@@ -512,6 +512,7 @@ function wp_dropdown_categories( $args = '' ) {
  *     @type string       $style                 The style used to display the categories list. If 'list', categories
  *                                               will be output as an unordered list. If left empty or another value,
  *                                               categories will be output separated by `<br>` tags. Default 'list'.
+ *     @type string       $taxonomy              Name of the taxonomy to retrieve. Default 'category'.
  *     @type string       $title_li              Text to use for the list title `<li>` element. Pass an empty string
  *                                               to disable. Default 'Categories'.
  *     @type bool|int     $use_desc_for_title    Whether to use the category description as the title attribute.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49059';
+$wp_version = '5.6-alpha-49060';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.