Fix typos in Forms & DI chapters; add links in testing docs

closes #398

public/docs/_layout.jade

@@ -21,7 +21,7 @@ html(lang="en" ng-app="angularIOApp" itemscope itemtype="http://schema.org/Frame
       article(class="l-content-small grid-fluid docs-content")
         != yield
 
-        if current.path[3] == 'guide' && current.path[4]
+        if (current.path[3] == 'guide' || current.path[3] == 'testing') && current.path[4]
           != partial("../_includes/_next-item")
 
     != partial("../_includes/_footer")

public/docs/ts/latest/guide/dependency-injection.jade

@@ -300,7 +300,7 @@ include ../../../../_includes/_util-fns
   We emphasized earlier that designing a class for dependency injection makes it easier to test.
 
   Mission accomplished!  We don't even need the Angular Dependency Injection system to test the `HeroesComponent`.
-  We simply create a bew `HeroesComponent` with a mock service and poke at it:
+  We simply create a new `HeroesComponent` with a mock service and poke at it:
   ```
   it("should have heroes when created", () => {
     let hc = new HeroesComponent(mockService);

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

@@ -172,7 +172,7 @@ figure.image-display
 
     1. The `template` is simply the new element tag identified by the component's `select` property.
 
-    1. The `directives` array tells Angular that our templated depends upon the `HeroFormComponent`
+    1. The `directives` array tells Angular that our template depends upon the `HeroFormComponent`
     which is itself a Directive (as are all Components).
 
 .l-main-section

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

@@ -128,7 +128,7 @@ figure.image-display
 +makeExample('pipes/ts/src/app/exponential-strength-pipe.ts')
 
 :marked
-  This pipe definition reveals several few key points
+  This pipe definition reveals several key points
   * We import the `Pipe` decorator from the Angular library (while getting the usual symbols)
   * A pipe is a class
   * We decorate the class with the `@Pipe` decorator function.