[docs-patrol] Update Okta README for OIN authentication flow

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

## Changes Requiring Documentation Updates

### 1. Okta OIN setup docs reference a removed UI toggle

**Commit(s):** [`d4a878017a`](https://github.com/elastic/integrations/commit/d4a878017a331de5bf6ed3046ae4b8b64eddc5e5)

**What changed:**
- `packages/okta/manifest.yml` removed the `oin_app` boolean variable/toggle and introduced an authentication method selector via `var_groups` (`Authentication Method`) with options including `oin_app`.
- The same commit also made agentless the default deployment mode.

**Evidence:**
- Docs still instruct a removed setting:
- `packages/okta/docs/README.md` line 49: `Set the "Use OIN Authentication" toggle to true`
- `packages/okta/_dev/build/docs/README.md` line 49: same instruction
- Current manifest uses selector-based auth instead of a toggle:
- `packages/okta/manifest.yml` lines 233-263 (`var_groups` with `auth_method` and option `oin_app`)

**Documentation impact:**
Users following current Okta OIN steps are directed to a toggle that no longer exists, which can block or mislead configuration.

## Suggested Actions

- [ ] Update `packages/okta/_dev/build/docs/README.md` OIN setup steps to use **Authentication Method = OIN App (OAuth 2.0)** instead of a "Use OIN Authentication" toggle.
- [ ] Regenerate/publish package docs so `packages/okta/docs/README.md` reflects the updated OIN flow.
- [ ] Confirm the updated instructions align with the current `var_groups` auth UX in `packages/okta/manifest.yml`.

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