[8.11](backport #3591) [apm] Add docs on a known issue with APM Server + APM Java agent

[mergify]

This is an automatic backport of pull request #3591 done by Mergify.
Cherry-pick of c151d92 has failed:

On branch mergify/bp/8.11/pr-3591
Your branch is up to date with 'origin/8.11'.

You are currently cherry-picking commit c151d928.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/en/apm-server/agent-server-compatibility.asciidoc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/en/apm-server/known-issues.asciidoc

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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