N1C: Possible section rename

[mjang]

          I worry that https://docs.nginx.com/nginx-one/how-to/certificates/manage-certificates/#delete-a-deployed-certificate the term "deleting a deployed certificate" is too similar to "removing a deployed certificate". The only difference between the two is that when users choose to delete a managed cert object from N1 console, there is a checkbox which allows them to remove the certificate from the instances/CSGs where it was deployed to. One is for removing a single certificate from a single instance/CSG, the other one is for removing a single certificate from multiple instances/CSGs.

IMHO, the story flows more smoothly and there is less mental energy required for the customers to track the difference between those two actions, if we rename the section for delete a deployed certificate to just delete a managed certificate and explains how users could also remove a certificate from multiple instances/CSGs where it was deployed to, while they attempt to delete a managed cert object. Note that deleting a managed certificate object is a different action from removing a deployed cert.

In the delete a managed certificate section, we could explain that users could delete a managed cert from N1 console, and meanwhile they also have the option to remove a deployed certificate from all the affected instances/CSGs where it was deployed to. In this way, we are also consistent with what we mean by removing a deployed certificate.

I hope this makes sense!

Originally posted by @sylwang in #230 (comment)