Docs: acme_certificate naming

[Subbeh]

Reference

https://opnsense.ansibleguy.net/modules/acmeclient.html#examples

Problem Found

The example given for creating a new certificate uses the acme_action instead of acme_certificate module.

Side note: the acme_certificate module creates the certificate but doesn't actually request this. Not sure if this is by design, or if I'm missing something.