removing "Example 7" description from spec

as I don't copy the full example to the docs file `docs/components/action.md`.

#257

Author: fiedl

spec/usage/components/action_spec.rb

@@ -384,7 +384,7 @@ def page2
 
     end
 
-    specify "Example 7 - Async delete request with confirm option" do
+    specify "Async delete request with confirm option" do
 
       class ActionTestController < TestController
         def destroy