Add clarity to custom certificates

Adam Lauzonrequested to merge
adamlauzon-update-dedicate-custom-certs into master

What does this MR do and why?

Change the description for Custom Certificates to make it clearer about what it is used for. There has been some confusion that this could be used for customers to provide their own certificate for their GitLab Dedicated instance rather than using Let's Encrypt.

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Before After

How to set up and validate locally

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