docs: release notes for the v20.2.0-rc.1 release #1803

Job	Run time
lint	2m 5s
build	22s
e2e_windows (windows-2025, 22, npm, 1)	25s
e2e_windows (windows-2025, 22, npm, 5)	32s
e2e_windows (windows-2025, 22, npm, 0)	26s
e2e_windows (windows-2025, 22, npm, 3)	31s
e2e_windows (windows-2025, 22, npm, 2)	33s
e2e_windows (windows-2025, 22, esbuild, 1)	24s
e2e_windows (windows-2025, 22, esbuild, 0)	32s
e2e_windows (windows-2025, 22, npm, 4)	30s
e2e_windows (windows-2025, 22, esbuild, 2)	28s
e2e_windows (windows-2025, 22, esbuild, 4)	35s
e2e_windows (windows-2025, 22, esbuild, 5)	48s
e2e_windows (windows-2025, 22, esbuild, 3)	26s
Browser Compatibility Tests	-1s
e2e-package-managers	0s
publish-snapshots	-1s
e2e-snapshots	0s
e2e	0s
test	-1s
	8m 34s

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