[Checklist] Clarify Mnnnn or Snnnn are unique

[RobDolinMS]

Per discussion with @fearthecowboy and others, "nnnn" alone will not be unique but "Mnnnn" or "Snnnn" will be unique.

Also formats that paragraph with one sentence per line for readability.

Signed-off-by: Rob Dolin robdolin@microsoft.com

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[msftclas]

@RobDolinMS,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[sarangan12]

Thanks for submitting this. I will review this and get back to you shortly

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