docs(ngmodule): Fix typo

closes #2104
Remove redundant `by` word.

Author: trotyl

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

@@ -1504,7 +1504,7 @@ a#q-bootstrap_vs_entry_component
 
   A bootstrapped component _is_ an [entry component](#entry-component-defined).
   It's an entry component that Angular loads into the DOM during the bootstrap (application launch) process.
-  Other entry components are loaded by dynamically by other means such as with the router.
+  Other entry components are loaded dynamically by other means such as with the router.
 
   The `@NgModule.bootstrap` property tells the compiler _both_ that this is an entry component _and_
   that it should generate code to bootstrap the application with this component.