Merge branch 'improve_qa_page_readme' into 'master'

Improve QA page README

See merge request gitlab-org/gitlab-ce!22176

qa/qa/page/README.md

@@ -86,8 +86,12 @@ module Page
 end
 ```
 
-It is possible to use `element` DSL method without value, with a String value
-or with a Regexp.
+The `view` DSL method declares the filename of the view where an
+`element` is implmented.
+
+The `element` DSL method in turn declares an element and defines a value
+to match to the actual view code. It is possible to use `element` with value,
+with a String value or with a Regexp.
 
 ```ruby
 view 'app/views/my/view.html.haml' do