CSS Networking - Update SNAT method priority.md

[mmadrigal98]

This change is intended to add a clarification note to make it clear that NAT Gateway takes precedence over all other methods, including instance-level public IP. This is already documented in the NAT Gateway product page.

Also modifying the old reference of instance-level IP that said that it would take precedence over all the other methods.

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[Court72]

@mbender-ms

Can you review the proposed changes?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

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

[mbender-ms]

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