Spelling, grammar updates

Author: AaronHolbrook

_site/about.html

@@ -78,7 +78,7 @@
         <h3 class="panel-title">About</h3>
       </div>
 
-    <p>Backbone Tutorials is a collection of tutorials written by <a href="http://thomasdav.is">Thomas Davis</a>. Everything is open source and I try my best to keep the tutorials updated. Though I am busy and only work on this is my spare time so many <a href="https://github.com/thomasdavis/backbonetutorials/graphs/contributors">contributors</a> have also help me put this resource together.</p>
+    <p>Backbone Tutorials is a collection of tutorials written by <a href="http://thomasdav.is">Thomas Davis</a>. Everything is open source and I try my best to keep the tutorials updated. Though I am busy and only work on this in my spare time, so many <a href="https://github.com/thomasdavis/backbonetutorials/graphs/contributors">contributors</a> have also help me put this resource together.</p>
     </div>
   </div>
   <div class="col-lg-8">