Update flow-deploy.md

[AhmadAbdullah91]

AI hub doesn't support custom VNET.

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[Court72]

@lgayhardt

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

[lgayhardt]

#sign-off