Merge pull request #36 from badcc/patch-1

Minor spelling fix on doc

docs/getting-started.html

@@ -126,7 +126,7 @@
 	./gravity -x exec.json
 			</code></pre>
 			
-			<p>To directly execute a gravity file (without first serialize it to json):</p>
+			<p>To directly execute a gravity file (without first serializing it to json):</p>
 			<pre><code>
 	./gravity myfile.gravity
 			</code></pre>