Update Invoke-AzSqlInstanceFailover.md

[markallisongit]

Description

We're not removing a managed instance, just failing it over. Copy and paste bug?

Checklist

• [ x] I have read the Submitting Changes section of CONTRIBUTING.md
• [ x] The title of the PR is clear and informative
• [ x] 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
• [x ] The PR does not introduce breaking changes
• [ x] If applicable, the changes made in the PR have proper test coverage
• [x ] 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}
  • [ x] the markdown help files have been regenerated using the commands listed here

[ghost]

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

[BethanyZhou]

Hi @MilanBrkicFON, could you help to verify this change?

[milanbrkic-ms]

lgtm

[BethanyZhou]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).