Update playbooks_loops.rst

[pallxk]

Document version requirement for retries without until keyword.

Fix #1122.

Ref https://github.com/ansible/ansible/blob/v2.16.0/changelogs/changelog.yaml#L465-L466

[ansible-documentation-bot[bot]]

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[patchback[bot]]

Backport to stable-2.16: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2.16/8fe654e5836bec494a4c47bc51656645b62ab5ea/pr-1569

Backported as https://github.com/ansible/ansible-documentation/pull/1577

🤖 @patchback I'm built with octomachinery and my source is open — https://github.com/sanitizers/patchback-github-app.

[samccann]

Thanks @pallxk for the Ansible docs fix and welcome to the Ansible project!

[patchback[bot]]

Backport to stable-2.17: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2.17/8fe654e5836bec494a4c47bc51656645b62ab5ea/pr-1569

Backported as https://github.com/ansible/ansible-documentation/pull/1578

🤖 @patchback I'm built with octomachinery and my source is open — https://github.com/sanitizers/patchback-github-app.