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.

git-svn-id: https://develop.svn.wordpress.org/trunk@51000 602fd350-edb4-49c9-b593-d223f7449a82

src/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
 	 *