docs: release notes for the v20.1.5 release #1766

Job	Run time
build	25s
lint	2m 23s
e2e_windows (windows-2025, 22, npm, 0)	50s
e2e_windows (windows-2025, 22, npm, 3)	34s
e2e_windows (windows-2025, 22, npm, 2)	58s
e2e_windows (windows-2025, 22, esbuild, 4)	28s
e2e_windows (windows-2025, 22, npm, 1)	37s
e2e_windows (windows-2025, 22, npm, 4)	33s
e2e_windows (windows-2025, 22, esbuild, 2)	31s
e2e_windows (windows-2025, 22, esbuild, 0)	29s
e2e_windows (windows-2025, 22, esbuild, 5)	1m 5s
e2e_windows (windows-2025, 22, esbuild, 1)	33s
e2e_windows (windows-2025, 22, esbuild, 3)	29s
e2e_windows (windows-2025, 22, npm, 5)	1m 37s
test	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
e2e-package-managers	0s
e2e-snapshots	0s
e2e	0s
	11m 32s

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