Update recording-rules.md (#9324)

**What this PR does / why we need it**:

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

**Checklist**
- [ ] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_index.md`

docs/sources/operations/recording-rules.md

@@ -15,7 +15,7 @@ Samples generated by recording rules are sent to Prometheus using Prometheus' **
 
 ## Write-Ahead Log (WAL)
 
-All samples generated by recording rules are written to a WAL. The WAL's main benefit is that it persists the samples
+All samples generated by recording rules are written to a WAL. The WALs main benefit is that it persists the samples
 generated by recording rules to disk, which means that if your `ruler` crashes, you won't lose any data.
 We are trading off extra memory usage and slower start-up times for this functionality.