Adjust CLA request template

doc/developer/code-contribution.md

@@ -36,14 +36,19 @@ git checkout -b <branch name>
   For pull requests made by contributors not yet added to the approved contributor list, a reviewer may respond: 
   
   ```
-  Thanks @[username] for the pull request! 
-  
-  Before we can review, we need to add you to the list of [approved contributors](https://docs.google.com/spreadsheets/d/1NTCeG-iL_VS9bFqtmHSfwETo5f-8MQ7oMDE5IUYJi_Y/pubhtml?gid=0&single=true).  
-  Please help complete the Mattermost [contribution license agreement](http://www.mattermost.org/mattermost-contributor-agreement/), which is a standard procedure for many open source projects. More information is in the above link. 
-  
-  Please let us know if you have any questions. 
-  
-  We are very happy to have you join our growing community!
+Thanks @[GITHUB_USERNAME] for the pull request! 
+
+Before we can review, we need to add you to the list of approved contributors for the Mattermost project.
+
+**Please help complete the Mattermost [contribution license agreement](http://www.mattermost.org/mattermost-contributor-agreement/)?**
+
+This is a standard procedure for many open source projects. You can view of list of past contributors who have completed the form [here](https://docs.google.com/spreadsheets/d/1NTCeG-iL_VS9bFqtmHSfwETo5f-8MQ7oMDE5IUYJi_Y/pubhtml?gid=0&single=true). 
+
+After completing the form, it should be processed within 24 hours and reviewers for your pull request will be able to proceed. 
+
+Please let us know if you have any questions. 
+
+We are very happy to have you join our growing community!
 ```