Updated how to contribute.md instructions (ServiceNowDevProgram#698)

* Create Update fields on User Change

* Update Update fields on User Change

* Update fields on User Change

* Update CONTRIBUTING.md

Issue: Github does not automatically switch you over the new branch when it is created. 

Including clarification steps to prevent users from committing updates to the main branch. We ask them to create a new branch, but never instruct them to switch over to that branch. As per Earl's feedback - "This can be averted in the future just by making sure you always create a new branch when working on something new. And specifically, creating a new branch from a clean main branch."

* Delete GlideAjax/Reusable glideajax table query/Update fields on User Change

Author: JBscriptsNow

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 To contribute, just follow these steps:
 
 1. Fork this repo
-2. Create a new branch (name it according to what functionality you are adding)
+2. Create a new branch (name it according to what functionality you are adding). From the main branch dropdown, switch to your new branch. 
 3. Add, edit, or re-organize Code Snippets by editing folders and files and commiting them to your forked repository
 4. Submit a pull request to the main branch of `ServiceNowDevProgram / code-snippets`
   - Pull requests should have a title/comment that describes what is being added/changed