promtail/scraping.md: Fix 404 (#7317)
promtail/scraping.md: Fix 404 (#7317)

**What this PR does / why we need it**:
Currently the `Cloudflare` link refers to:
https://grafana.com/docs/loki/latest/clients/configuration/#cloudflare
But it should be:
https://grafana.com/docs/loki/latest/clients/promtail/configuration/#cloudflare

**Checklist**
- [X] Reviewed the `CONTRIBUTING.md` guide
- [ ] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_index.md`
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