Fix url_helper examples in testing guide [ci skip]

guides/source/testing.md

@@ -1085,16 +1085,16 @@ The `get` method kicks off the web request and populates the results into the `@
 
 All of these keyword arguments are optional.
 
-Example: Calling the `:show` action, passing an `id` of 12 as the `params` and setting `HTTP_REFERER` header:
+Example: Calling the `:show` action for the first `Article`, passing in an `HTTP_REFERER` header:
 
 ```ruby
-get article_url, params: { id: 12 }, headers: { "HTTP_REFERER" => "http://example.com/home" }
+get article_url(Article.first), headers: { "HTTP_REFERER" => "http://example.com/home" }
 ```
 
-Another example: Calling the `:update` action, passing an `id` of 12 as the `params` as an Ajax request.
+Another example: Calling the `:update` action for the last `Article`, passing in new text for the `title` in `params`, as an Ajax request:
 
 ```ruby
-patch article_url, params: { id: 12 }, xhr: true
+patch article_url(Article.last), params: { article: { title: "updated" } }, xhr: true
 ```
 
 NOTE: If you try running `test_should_create_article` test from `articles_controller_test.rb` it will fail on account of the newly added model level validation and rightly so.