[9.2] (backport #10601) Add batching config docs

[mergify]

Fixes https://github.com/elastic/opentelemetry-dev/issues/1015

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This is an automatic backport of pull request #10601 done by Mergify.

[mergify]

Cherry-pick of 01936d2 has failed:

On branch mergify/bp/9.2/pr-10601
Your branch is up to date with 'origin/9.2'.

You are currently cherry-picking commit 01936d2da.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/reference/edot-collector/config/default-config-standalone.md

no changes added to commit (use "git add" and/or "git commit -a")

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

[github-actions]

🔍 Preview links for changed docs

• docs/reference/edot-collector/config/default-config-standalone.md