[enterprise-4.12] OBSDOCS-932: Add clarifications about storage in the Tempo docs

[openshift-cherrypick-robot]

This is an automated cherry-pick of #73716

/assign stevsmit

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OBSDOCS-932

In response to this:

This is an automated cherry-pick of #73716

/assign stevsmit

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[ocpdocs-previewbot]

🤖 Mon Apr 08 19:05:58 - Prow CI generated the docs preview:

https://74371--ocpdocs-pr.netlify.app/
https://74371--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/distr_tracing/distr_tracing_tempo/distr-tracing-tempo-installing.html

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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