made some typo changes in the caching.md file (#11214)

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

There were some typo mistakes that I fixed in the **caching.md** file
and it was mentioned in the issue that I have given below.

**Which issue(s) this PR fixes**:
Fixes [Issue #9073](#9073)

**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/setup/upgrade/_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)
- [ ] If the change is deprecating or removing a configuration option,
update the `deprecated-config.yaml` and `deleted-config.yaml` files
respectively in the `tools/deprecated-config-checker` directory.
[Example
PR](0d4416a)

Signed-off-by: Bilal Khan <[email protected]>
Co-authored-by: J Stickler <[email protected]>

docs/sources/operations/caching.md

@@ -45,8 +45,8 @@ To enable and configure Memcached:
 
        The options `host` and `service` depend on the type of installation. For example, using the `bitnami/memcached` Helm Charts with the following commands, the `service` values are always `memcached`.
        ```
-       helm upgrade --install chunk-cache -n loki bitnami/memcached -f memcached-overrides.yaml
-       helm upgrade --install results-cache -n loki bitnami/memcached -f memcached-overrides.yaml
+       helm upgrade --install chunk-cache -n loki bitnami/memcached -f memcached-overrides-chunk.yaml
+       helm upgrade --install results-cache -n loki bitnami/memcached -f memcached-overrides-results.yaml
        ```
        The current Helm Chart only supports the chunk and results cache.
 
@@ -57,13 +57,13 @@ To enable and configure Memcached:
            chunk_cache:
              enabled: true
              host: chunk-cache-memcached.loki.svc
-             service: memcache
+             service: memcached-client
              batch_size: 256
              parallelism: 10
            results_cache:
              enabled: true
              host: results-cache-memcached.loki.svc
-             service: memcache
+             service: memcached-client
              default_validity: 12h
        ```
     1. If the Loki configuration is used, modify the following three sections in