Replace an instance of "Github" with "GitHub"

This is user-facing in the GitHub app, so it would be nice if it
was correct.

Author: jdennes

docs/divecloud

@@ -1,9 +1,9 @@
 DiveCloud integrates Application Performance Testing into the Continuous Integration Cycle by allowing you to run a performance test after each successful deployment.
 
-When Github receives notice that you have successfully deployed your application, it will initiate a performance test based on the test plan you created at https://divecloud.nouvola.com. 
+When GitHub receives notice that you have successfully deployed your application, it will initiate a performance test based on the test plan you created at https://divecloud.nouvola.com. 
 
-Please enter your API Key and the Plan ID for the plan that you would like to run on successful deployment of your application. 
+Please enter your API Key and the Plan ID for the plan that you would like to run on successful deployment of your application.
 
-If you would like to add 'Think Time' to you test, select the 'Think Time' checkbox. 
+If you would like to add 'Think Time' to you test, select the 'Think Time' checkbox.
 
-If your test plan includes credentials, include your credential password in the field below. 
+If your test plan includes credentials, include your credential password in the field below.