docs: add `DropdownMenu` documentation #7542

Job	Run time
Tests / Build	1m 0s
Tests / Static Checks	2m 29s
Tests / A11y Tests	5m 36s
Tests / Playwright Tests (chrome)	3m 20s
Tests / Playwright Tests (firefox)	3m 13s
Tests / Unit Tests	3m 10s
Artifacts / Build	4m 46s
Visual Tests / Chromatic	1m 58s
Artifacts / Deploy	48s
	26m 20s

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