doc(guide): add links to angular-seed examples

The examples in the angular-seed project are better than nothing,
which is what we currently have here!

Author: iffy

docs/content/guide/dev_guide.e2e-testing.ngdoc

@@ -176,3 +176,7 @@ JavaScript is a dynamically typed language which comes with great power of expre
 come with almost no-help from the compiler. For this reason we feel very strongly that any code
 written in JavaScript needs to come with a strong set of tests. We have built many features into
 angular which makes testing your angular applications easy. So there is no excuse for not testing.
+
+
+# Example
+See the {@link angular-seed https://github.com/angular/angular-seed} project for an example.

docs/content/guide/dev_guide.unit-testing.ngdoc

@@ -348,4 +348,5 @@ ou
 ou
 
 ## Sample project
-uoe
+See the {@link angular-seed https://github.com/angular/angular-seed} project for an example.
+