docs(form): Fix typo of mismatch of quotes.

closes #639

public/docs/ts/latest/guide/forms.jade

@@ -335,7 +335,7 @@ figure.image-display
     We're used to seeing an `$event` object coming from a DOM event.
     The `ngModelChange` property doesn't produce a DOM event; it's an Angular `EventEmitter`
     property that returns the input box value when it fires — which is precisely what
-    we should assign to the model's `name' property.
+    we should assign to the model's `name` property.
 
     Nice to know but is it practical? We almost always prefer `[(ngModel)]`.
     We might split the binding if we had to do something special in