[docs-patrol] Update JumpCloud README to document newly visible starting_point option

Recent code changes in the repository have introduced documentation drift. The following change needs a corresponding documentation update.

## Changes Requiring Documentation Updates

### 1. JumpCloud `starting_point` is now user-visible but not documented in package README

**Commit(s):** [`d43ff234d21161ef4cbbc25d56415e4aa72680d9`](https://github.com/elastic/integrations/commit/d43ff234d21161ef4cbbc25d56415e4aa72680d9)

**What changed:** In `packages/jumpcloud/data_stream/events/manifest.yml`, `starting_point` was changed from hidden advanced config to visible user config (`show_user: true`) and gained explicit format guidance (Go duration syntax, unsupported `d` unit, examples) with default `-360h`.

**Documentation impact:** `packages/jumpcloud/docs/README.md` should include this setting in the configuration section (purpose, accepted format, examples, and default) so users configuring the integration understand how to set it correctly.

**Evidence:**
- New visible option and guidance: `packages/jumpcloud/data_stream/events/manifest.yml` lines 30-40
- README configuration section omits `starting_point`: `packages/jumpcloud/docs/README.md` lines 23-39 (and no `starting_point` mention in file)

## Suggested Actions

- [ ] Add a "Starting point" subsection to `packages/jumpcloud/docs/README.md` under Configuration.
- [ ] Document accepted value format (negative Go duration with `h/m/s`), unsupported `d` unit, and examples from manifest.
- [ ] Document the default value (`-360h`) and clarify first-run behavior.

> [!NOTE]
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> 🔒 Integrity filter blocked 22 items
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> - [#18991](https://github.com/elastic/integrations/pull/18991) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
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