REST API: Update “object” strings to use the appropriate nouns.

This updates route arguments and schema descriptions to use more specific object types for clarity.

Follow-up to [39342].

Props lephleg, jnylen0.
Fixes #40720.
Built from https://develop.svn.wordpress.org/trunk@51000


git-svn-id: http://core.svn.wordpress.org/trunk@50609 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-settings-controller.php

@@ -27,7 +27,7 @@ class WP_REST_Settings_Controller extends WP_REST_Controller {
 	}
 
 	/**
-	 * Registers the routes for the objects of the controller.
+	 * Registers the routes for the site's settings.
 	 *
 	 * @since 4.7.0
 	 *