Update New-AzAutomationSourceControl.md

[isjwuk]

Depersonalised (replaced "My Azure Automation account" with "an Azure Automation account".
Would also like to query the $token values in lines 32, 54, 75 - are these meant to be included or are they the authors personal access tokens?

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[ghost]

Thank you for your contribution isjwuk! We will review the pull request and get back to you soon.

[isra-fel]

Hey Chris, thanks for the contribution!
As for the access token, I believe they are not real ones, as they are not in the form of a json web token.

[isra-fel]

/azp run azure-powershell - security-tools

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