Docs : fix promtal typo (#9951)

**What this PR does / why we need it**: Fix a typo in installation
documentation, Promtal instead of Promtail

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

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [x] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_index.md`
- [ ] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](d10549e)

Co-authored-by: J Stickler <julie.stickler@grafana.com>

docs/sources/installation/local.md

@@ -56,7 +56,7 @@ The configuration specifies running Loki as a single binary.
 Loki runs and displays Loki logs in your command line and on http://localhost:3100/metrics.
 
 The next step will be running an agent to send logs to Loki.
-To do so with Promtail, refer to the [Promtal configuration]({{< relref "../clients/promtail" >}}).
+To do so with Promtail, refer to the [Promtail configuration]({{< relref "../clients/promtail" >}}).
 
 ## Release binaries - openSUSE Linux only