Fix language tags in doc-snippets

The doc-snippets were inconsistent
(no spaces before title, small-caps, JS
instead of JavaScript, etc.)

apps/tests/ui/scroll-view/scroll-view-tests.ts

@@ -14,7 +14,7 @@ import scrollViewModule = require("ui/scroll-view");
 // ```
 
 // ### Declaring the ScrollView.
-//```XML
+//``` XML
 // <Page>
 //  <ScrollView>
 //    {%raw%}<Image src="{{ someBigImageUrl }}" />{%endraw%}