Docs: Improve documentation for `add_existing_user_to_blog()`.

Props stevenlinx.
Fixes #50243.
Built from https://develop.svn.wordpress.org/trunk@47854


git-svn-id: http://core.svn.wordpress.org/trunk@47630 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-functions.php

@@ -2162,7 +2162,12 @@ function maybe_add_existing_user_to_blog() {
  *
  * @since MU (3.0.0)
  *
- * @param array $details User details.
+ * @param array $details {
+ *     User details. Must at least contain values for the keys listed below.
+ *
+ *     @type int    $user_id The ID of the user being added to the current blog.
+ *     @type string $role    The role to be assigned to the user.
+ * }
  * @return true|WP_Error|void True on success or a WP_Error object if the user doesn't exist
  *                            or could not be added. Void if $details array was not provided.
  */

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47853';
+$wp_version = '5.5-alpha-47854';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.