Move test method to the bottom

The reason for the change is that reading the code it should be si-
milar to reading a newspaper, where high-level information is at
the top, like the title and summary of the news, and low level, or
more specific information, are at the bottom.

This improves code readability.

qa/qa/specs/features/browser_ui/3_create/wiki/create_edit_clone_push_wiki_spec.rb

@@ -3,11 +3,6 @@
 module QA
   context 'Create' do
     describe 'Wiki management' do
-      def validate_content(content)
-        expect(page).to have_content('Wiki was successfully updated')
-        expect(page).to have_content(/#{content}/)
-      end
-
       it 'user creates, edits, clones, and pushes to the wiki' do
         Runtime::Browser.visit(:gitlab, Page::Main::Login)
         Page::Main::Login.perform(&:sign_in_using_credentials)
@@ -38,6 +33,11 @@ module QA
 
         expect(page).to have_content('My Third Wiki Content')
       end
+
+      def validate_content(content)
+        expect(page).to have_content('Wiki was successfully updated')
+        expect(page).to have_content(/#{content}/)
+      end
     end
   end
 end