[8.7] docs: Document privileges to read RUM source maps; Update examples (backport #11741)

[mergify]

This is an automatic backport of pull request #11741 done by Mergify.
Cherry-pick of 00fb30e has failed:

On branch mergify/bp/8.7/pr-11741
Your branch is up to date with 'origin/8.7'.

You are currently cherry-picking commit 00fb30eb6.
  (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/legacy/api-keys.asciidoc
	modified:   docs/legacy/feature-roles.asciidoc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/legacy/configuration-rum.asciidoc

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

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @carsonip? 🙏