docs(styleguide): remove 'escape=html' for script ex

Author: wardbell

public/docs/_includes/styleguide/_code-examples.jade

@@ -159,7 +159,7 @@ include ../../../_includes/_util-fns
     :marked
         HTML files can also contain #docregion comments:
 
-    code-example(format="linenums" language="html" escape="html").
+    code-example(format="linenums" language="html").
       <!-- #docregion -->
       ...
       <script src="https://code.angularjs.org/2.0.0-beta.7/angular2.sfx.dev.js"></script>