Principal typo (was princial)

[geologyrocks]

Description

There were 3 typos in the Examples section. Princial instead of principal.

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 geologyrocks! We will review the pull request and get back to you soon.

[msJinLei]

Thanks for the contribution. No need to update ChangeLog.md if only to update help doc.

[msJinLei]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s), but failed to run 1 pipeline(s).

[msJinLei]

/azp run azure-powershell - powershell-core

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[msJinLei]

/azp run azure-powershell - windows-powershell

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).