docs(template-syntax): tweak [(ngModel)] section header

Author: wardbell

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

@@ -873,7 +873,7 @@ block style-property-name-dart-diff
 :marked
   There’s a story behind this construction, a story that builds on the property and event binding techniques we learned previously.
 
-  ### Inside [(ngModel)]
+  ### Inside `[(ngModel)]`
   We could have achieved the same result with separate bindings to
   the `<input>` element's  `value` property and `input` event.
 +makeExample('template-syntax/ts/app/app.component.html', 'without-NgModel')(format=".")

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

@@ -873,7 +873,7 @@ block style-property-name-dart-diff
 :marked
   There’s a story behind this construction, a story that builds on the property and event binding techniques we learned previously.
 
-  ### Inside [(ngModel)]
+  ### Inside `[(ngModel)]`
   We could have achieved the same result with separate bindings to
   the `<input>` element's  `value` property and `input` event.
 +makeExample('template-syntax/ts/app/app.component.html', 'without-NgModel')(format=".")