docs(design): describe the Door as the two-button group it is #1584

Job	Run time
Build & Test	2m 39s
Standalone Smoketest	2m 27s
Standalone Platform Check (windows-latest)	1m 41s
Standalone Platform Check (macos-latest)	56s
Webview Boot Smoketest	53s
Build & Test	4m 2s
Standalone Smoketest	2m 27s
Webview Boot Smoketest	53s
Standalone Platform Check (windows-latest)	1m 41s
Standalone Platform Check (macos-latest)	56s
	18m 35s

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