docs(upgrade): change dot to comma (#3337)

Author: AlexanderLukin

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

@@ -1391,7 +1391,7 @@ code-example(format="").
   This is similar to the phone list component. 
   The new wrinkle is the `RouteParams` type annotation that identifies the `routeParams` dependency. 
 
-  The AngularJS injector has an AngularJS router dependency called `$routeParams`.
+  The AngularJS injector has an AngularJS router dependency called `$routeParams`,
   which was injected into `PhoneDetails` when it was still an AngularJS controller.
   We intend to inject it into the new `PhoneDetailsComponent`.