docs: add end-user terms disclosures guide; link refund policy in receipts#579

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06-12-docs_add_end-user_terms_disclosures_guide_link_refund_policy_in_receiptslightsparkdev/grid-api:06-12-docs_add_end-user_terms_disclosures_guide_link_refund_policy_in_receiptsCopy head branch name to clipboard