Update co-location.md

[gmoseley-MSFT]

Added a section to explain that PPG can be bound to VMs across RG

[prmerger-automator]

@gmoseley-MSFT : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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[Jak-MS]

@mattmcinnes
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[v-dirichards]

I sent an email to the content owner today.

@MicrosoftDocs/public-repo-pr-review-team

[github-actions]

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