Update persistence actions docs

[mherwege]

Persistence actions have been extended to work with future persisted states in https://github.com/openhab/openhab-core/pull/3736.

This PR extends the documentation to provide a full list of all actions.

[netlify[bot]]

✅ Thanks for your pull request to the openHAB documentation! The result can be previewed at the URL below (this comment and the preview will be updated if you add more commits).

Built without sensitive environment variables

Name	Link
🔨 Latest commit	04be502fbff887d987737602ba5805ed0af8539f
🔍 Latest deploy log	https://app.netlify.com/sites/openhab-docs-preview/deploys/66308fc7a978ac00085ec8a4
😎 Deploy Preview	https://deploy-preview-2289--openhab-docs-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify[bot]]

✅ Thanks for your pull request to the openHAB documentation! The result can be previewed at the URL below (this comment and the preview will be updated if you add more commits).

Built without sensitive environment variables

Name	Link
🔨 Latest commit	31062517d57bb761f894cbe780b631e3dde09bb9
🔍 Latest deploy log	https://app.netlify.com/sites/openhab-docs-preview/deploys/66334aef4bd1a4000881c8d3
😎 Deploy Preview	https://deploy-preview-2289--openhab-docs-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[J-N-K]

@openhab/documentation-maintainers can you ping me when this is ready for merge? I'll merge the core PR then.

[mherwege]

It is return value but not documented …

There was some documentation, but in the Examples section. I moved it up and extended it a bit.