misc: make block comment a Jade comment

(This prevents the text from appearing in the generated HTML as an HTML
comment.)

Author: chalin

public/docs/ts/latest/guide/template-syntax.jade

@@ -401,7 +401,7 @@ table
   (element | component | directive) event, or (rarely) an attribute name.
   The following table summarizes:
 
-// If you update this table, UPDATE it in Dart & JS, too.
+//- If you update this table, UPDATE it in Dart & JS, too.
 <div width="90%">
 table
   tr
@@ -813,7 +813,7 @@ block style-property-name-dart-diff
   including queries and saves to a remote server.
   These changes percolate through the system and are ultimately displayed in this and other views.
 
-//
+//-
   :marked
     ### Event bubbling and propagation [TODO: reinstate this section when it becomes true]
     Angular invokes the event-handling statement if the event is raised by the current element or one of its child elements.