[docs-patrol] Update filestream config text for logs.ecs stream

Recent code changes introduced documentation drift in the filestream package manifest.

## Changes Requiring Documentation Updates

### 1. Filestream setting now targets `logs.ecs`, but two descriptions still reference `logs`

**Commit(s):** `87ca21c0ec4aa3e8191ea0c49dad3022f3ab4c71` (`Use the \`logs.ecs\` index instead of \`logs\``)

**What changed:**
- `packages/filestream/agent/input/filestream.yml.hbs` changed from `index: logs` to `index: logs.ecs`.
- `packages/filestream/manifest.yml` updated the setting title/description to `"logs.ecs" data stream`.

**Documentation impact:**
In `packages/filestream/manifest.yml`, two user-facing descriptions are still stale and reference the old stream name:
- `packages/filestream/manifest.yml:53` — `This field is ignored when 'Use the "logs" data stream' is enabled` (for `data_stream.dataset`)
- `packages/filestream/manifest.yml:61` — `This field is ignored when 'Use the "logs" data stream' is enabled` (for `pipeline`)

These should reference `"logs.ecs"` for consistency with current behavior and the updated `use_logs_stream` setting text.

## Suggested Actions

- [ ] Update `packages/filestream/manifest.yml` line text in the `data_stream.dataset` description to say `Use the "logs.ecs" data stream`.
- [ ] Update `packages/filestream/manifest.yml` line text in the `pipeline` description to say `Use the "logs.ecs" data stream`.
- [ ] Verify package docs/rendered UI strings consistently use `logs.ecs` for this setting.

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