Cleanup explore-sandbox.md

[MA3CIN]

Typos, formatting and redundancy fix

[nephio-prow]

Hi @MA3CIN. Thanks for your PR.

I'm waiting for a nephio-project member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[johnbelamaric]

/ok-to-test
/approve
/lgtm

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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