docs(index): fix typos and grammar for better readability

Closes #208

Author: realdubb

src/index.html

@@ -262,16 +262,16 @@ <h1 id="wire-up-a-backend">Wire up a Backend</h1>
       <div class="span4">
         <h3>Deep Linking</h3>
         <p>
-          A deep link reflects where the user is in the app, this is useful so users can bookmark
-          and email links to locations within apps. Round trip apps get this automatically, but
-          AJAX apps by their nature do not. AngularJS combines the benefits of deep link with
+          A deep link reflects where the user is in the app. This is useful so users can bookmark
+          and email links to locations within the app. Round trip apps get this automatically, but
+          AJAX apps by their nature do not. AngularJS combines the benefits of deep linking with
           desktop app-like behavior.
         </p>
       </div>
       <div class="span4">
         <h3>Form Validation</h3>
         <p>
-          Client-side form validation is an important part of great user experience.
+          Client-side form validation is an important part of a great user experience.
           AngularJS lets you declare the validation rules of the form without having to write
           JavaScript code. Write less code, go have beer sooner.
         </p>
@@ -309,7 +309,7 @@ <h1 id="create-components">Create Components</h1>
       <div class="span4">
         <h3>Directives</h3>
         <p>
-          Directives is a unique and powerful feature available only in Angular. Directives let
+          Directives are a unique and powerful feature available only in Angular. Directives let
           you invent new HTML syntax, specific to your application.
         </p>
       </div>