Update quickstart-create-connect-server-vnet.md

[sdemontigny]

Link to download public SSL certificate was erroneous in the proposed wget command. Found the correct link in https://learn.microsoft.com/en-us/azure/mysql/flexible-server/security-tls-root-certificate-rotation

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit ac401a6:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/postgresql/connectivity/quickstart-create-connect-server-vnet.md	✅Succeeded

For more details, please refer to the build report.

[v-regandowner]

@gaurikasar

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

[github-actions]

This pull request has been inactive for 14 days. If you are finished with your changes, don't forget to sign off. See the contributor guide for instructions. If this PR is inactive for 14 more days, it will be closed automatically. Thank you!
SQL Docs Team: Contact Us
Contributor Guide

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @gkasar

[learn-build-service-prod]

Learn Build status updates of commit ac401a6:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/postgresql/connectivity/quickstart-create-connect-server-vnet.md	✅Succeeded

For more details, please refer to the build report.