[8.15](backport #4198) [APM] Document which fields are supported to create APM Service Groups #4285
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Fixes #4023
Documents which fields are supported to create APM service groups and removes a note from the service groups doc.
To do
cc @chrisdistasio @mielastic
This is an automatic backport of pull request #4198 done by [Mergify](https://mergify.com).