Merge branch 'axil-use-existing-img-for-help-test' into 'master'

Use an existing image for testing /help

See merge request gitlab-org/gitlab!24286

doc/user/markdown.md

@@ -896,6 +896,11 @@ Reference-style (hover to see title text):
 [logo]: img/markdown_logo.png "Title Text"
 ```
 
+<!--
+DO NOT change the name of markdown_logo.png. This is used for a test
+in spec/controllers/help_controller_spec.rb.
+-->
+
 Inline-style (hover to see title text):
 
 ![alt text](img/markdown_logo.png "Title Text")

spec/controllers/help_controller_spec.rb

@@ -111,7 +111,7 @@ describe HelpController do
         it 'renders the raw file' do
           get :show,
               params: {
-                path: 'fixtures/gitlab_tanuki'
+                path: 'user/img/markdown_logo'
               },
               format: :png
           expect(response).to be_successful