docs(ramps): align sandbox-testing page with api-reference source of truth#358

pengying wants to merge 2 commits into

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04-20-docs_ramps_align_sandbox-testing_page_with_api-reference_source_of_truthlightsparkdev/grid-api:04-20-docs_ramps_align_sandbox-testing_page_with_api-reference_source_of_truthCopy head branch name to clipboard