docs(architecture): correct link to testing

closes #1536

Author: raucher

firebase.json

@@ -22,6 +22,10 @@
       "source": "/docs/ts/latest/guide/setup.html",
       "destination": "/docs/ts/latest/index.html"
     },
+    {
+      "source": "/docs/ts/latest/testing",
+      "destination": "/docs/ts/latest/guide/testing.html"
+    },
     {
       "source": "/cheatsheet",
       "destination": "/docs/ts/latest/guide/cheatsheet.html"

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

@@ -538,5 +538,5 @@ code-example(language="javascript" linenumbers=".").
 :marked
   >displays a price of "42.33" as `$42.33`.
 
-  >**[Testing](../testing/index.html)** - Angular provides a testing library for "unit testing" our application parts as they
+  >**[Testing](testing.html)** - Angular provides a testing library for "unit testing" our application parts as they
   interact with the Angular framework.