Import internal commit 37c0921a9ef817cfde697f335588abf2ab525d23 : [APPROVAL] origin/review/bsls_platform-docs-missing-os-darwin-platform_drqs-36943777 to master
Import internal commit 37c0921a9ef817cfde697f335588abf2ab525d23 : [APPROVAL] origin/review/bsls_platform-docs-missing-os-darwin-platform_drqs-36943777 to master

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