Adding extra info about a firewall rule

[rajbos]

This pull request includes a significant update to the docs/docs/faq.md file. The update adds a new FAQ entry that details a potential issue during the first deployment with azd up, where the PostgreSQL server gets locked down to the virtual network. The solution provided involves adding the deploying IP address to the server's firewall rules.

Here are the key changes:

• docs/docs/faq.md: Added a new FAQ entry explaining a possible deployment error with azd up where the PostgreSQL server gets locked down to the virtual network. The solution involves adding the deploying IP address to the server's firewall rules. The change includes an example of the error messages that might be encountered, a screenshot of the server firewall settings, and a note to remember to remove the rule after successful deployment.

[gloveboxes]

@rajbos I've moved your trouble shooting notes to the deployment.md trouble shooting section. That PR should be merged tomorrow. Thanks again, cheers Dave