[Security] add comments in firewall configuration of security.rst to make the fi…

[bizmate]

add comments in firewall configuration of security.rst to make the firewall precedence more explicit

[javiereguiluz]

Diego, thanks for this contribution. I agree that it's important to mention how the firewall order is crucial. However, the proposed text had some issues in my opinion. First, it said "add a new firewall here ..." that could be understood like some instruction to newcomers. But they will wonder, why should I add a new firewall here? Is it mandatory? Which firewall should I add? etc.

Second, the comment looked like it belonged to the dev firewall instead of the entire config example. So, when merging, I reworded your contribution as follows: 8c14b05 and 8e2d950

[bizmate]

Diego, thanks for this contribution. I agree that it's important to mention how the firewall order is crucial. However, the proposed text had some issues in my opinion. First, it said "add a new firewall here ..." that could be understood like some instruction to newcomers. But they will wonder, why should I add a new firewall here? Is it mandatory? Which firewall should I add? etc.

Second, the comment looked like it belonged to the dev firewall instead of the entire config example. So, when merging, I reworded your contribution as follows: 8c14b05 and 8e2d950

LGTM

Thank you for merging it. Hopefully it will help and save others who dont know the ins and outs of this section some time when configuring firewalls :)