Update Install_AWSParallelCluster.md

[dchesterNIH]

Pull Request Template

Description

Provide a description of your changes here. If this PR is related to an issue, list the issue number/name here

Assignee

Assignees: @kyleoconnell-NIH and @petersonjdNIH

PR checklist

Please ensure the following:

• [ ] This comment contains a description of changes (with reason).
• [ ] All changes were tested.
• [ ] If you've fixed a bug mention the issue number/name.
• [ ] Apply approriate tags (e.g. documentation, bug)

[petersonjdNIH]

Is this ready for review and approval? I feel like I was notified because I'm still in your pull request template for this repo.