docs: add doc for grafana tempo

[vbehar]

No description provided.

[jenkins-x-bot-test]

Hi @vbehar. Thanks for your PR.

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[vbehar]

same as #3290 - I just deleted the branch by mistake...

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[jstrachan]

/ok-to-test

[jstrachan]

/lgtm

[jenkins-x-bot-test]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jstrachan

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[jenkins-x-bot-test]

⭐ PR built and available in a preview jenkins-x-jx-docs-pr-3292 here