Docs: Add and clarify changelog entries for elements that can now accept, use, or return WP_Post_Type objects.

Also adds a missing initial `@since` version for `wp_xmlrpc_server::_prepare_post_type()`.

See [37890]. See #36217.

Built from https://develop.svn.wordpress.org/trunk@38051


git-svn-id: http://core.svn.wordpress.org/trunk@37992 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-xmlrpc-server.php

@@ -881,6 +881,8 @@ class wp_xmlrpc_server extends IXR_Server {
 	/**
 	 * Prepares post data for return in an XML-RPC object.
 	 *
+	 * @since 3.4.0
+	 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 	 * @access protected
 	 *
 	 * @param WP_Post_Type $post_type Post type object.
@@ -921,6 +923,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		 * Filters XML-RPC-prepared date for the given post type.
 		 *
 		 * @since 3.4.0
+		 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 		 *
 		 * @param array        $_post_type An array of post type data.
 		 * @param WP_Post_Type $post_type  Post type object.