Update how-to-deploy-online-endpoints.md

[J-Silvestre]

Added important note for environments on model deployment. This information is important based on support requests we've received in which customers were confused about the necessary packages for inferencing environments.

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[ttorble]

@J-Silvestre did you intend to open this PR in the private repo? It looks like you have access to the private repo, and if so, you should use that for content updates. I'll leave this PR open in case @msakande wants to review it here. If you decide to open a new PR in the private repo, please close this PR. Thanks.

@msakande

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

[J-Silvestre]

@meerakurup , could you also give us your approval here?

I've already tested this myself and I know for a fact that was is written there is true. If you'd like to reach out to me about this, I can also give more details. FYI, Smit Shah (EEE Lead) asked me to update this document.

[msakande]

#sign-off

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@J-Silvestre : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.