[docs-patrol] Update Custom UDP Logs README for logs.ecs stream and 9.4.0 requirement

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

## Changes Requiring Documentation Updates

### 1. Custom UDP Logs "Use logs data stream" behavior changed, docs still describe old values

**Commit(s):** [`69393d70a4268d6b0b1191ef849330de28af7954`](https://github.com/elastic/integrations/commit/69393d70a4268d6b0b1191ef849330de28af7954)

**What changed:**
- `packages/udp/agent/input/udp.yml.hbs` now routes to `index: logs.ecs` when `use_logs_stream` is enabled.
- `packages/udp/manifest.yml` updated the option text to `"logs.ecs"` and raised the requirement to Elasticsearch `9.4.0+`.

**Documentation impact:**
- `packages/udp/docs/README.md` still says:
- "Use the \"logs\" data stream"
- Requires Elasticsearch `9.2.0+`
- `packages/udp/_dev/build/docs/README.md` has the same stale text.

This is materially incorrect for users configuring the feature and version compatibility.

## Suggested Actions

- [ ] Update `packages/udp/docs/README.md` to document `"logs.ecs"` (not `"logs"`) and Elasticsearch `9.4.0+` for this option.
- [ ] Regenerate/refresh `packages/udp/_dev/build/docs/README.md` so generated docs match the source README.

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