docs(tutorial/Tutorial): add missing word

Closes angular#12147

Author: scampi

docs/content/tutorial/index.ngdoc

@@ -199,7 +199,7 @@ http://localhost:8000/app/index.html
 
 <div class="alert alert-info">
 To serve the web app on a different ip address or port, edit the "start" script within package.json.
-You can `-a` to set the address and `-p` to set the port.
+You can use `-a` to set the address and `-p` to set the port.
 </div>
 
 ### Running Unit Tests