docs: add note about index cache and TSDB (backport release-3.3.x) (#16594)

Co-authored-by: Alexander Lindeskär <lindeskar@users.noreply.github.com>
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loki-gh-app[bot] 10 months ago committed by GitHub
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      docs/sources/operations/caching.md

@ -19,6 +19,7 @@ cache is configured to be in-memory by default.
- It is recommended to deploy three, or in the case of the Helm chart two, dedicated Memcached clusters.
- As of 2023-02-01, the `memcached:1.6.17-alpine` version of the library is recommended.
- Consult the Loki ksonnet [memcached](https://github.com/grafana/loki/blob/main/production/ksonnet/loki/memcached.libsonnet) deployment and the ksonnet [memcached library](https://github.com/grafana/jsonnet-libs/tree/master/memcached).
- Index caching is not required for the [TSDB](https://grafana.com/docs/loki/<LOKI_VERSION>/operations/storage/tsdb/#index-caching-not-required) index format.
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