docs(tutorial/step_12): small change to overview

The bullet points at the beginning of the article were a little hard to understand because they
didn't follow the grammatical form of the preceding articles. I hope these small modifications make
it a little easier for someone else to read.

Closes #9922

Author: danielmbarlow

docs/content/tutorial/step_12.ngdoc

@@ -9,8 +9,8 @@
 In this final step, we will enhance our phonecat web application by attaching CSS and JavaScript
 animations on top of the template code we created before.
 
-* Used the `ngAnimate` to enable animations throughout the application.
-* Common `ng` directives automatically trigger hooks for animations to tap into.
+* We now use the `ngAnimate` module to enable animations throughout the application.
+* We also use common `ng` directives to automatically trigger hooks for animations to tap into.
 * When an animation is found then the animation will run in between the standard DOM operation that
   is being issued on the element at the given time (e.g. inserting and removing nodes on
   {@link api/ng.directive:ngRepeat `ngRepeat`} or adding and removing classes on