Add browser 850 and other Go 1.20 PRs to release notes #3015

Job	Run time
test-tip (ubuntu-latest)	7m 9s
test-prev (1.20.x, ubuntu-latest)	4m 28s
test-tip (windows-2019)	15m 42s
test-current-cov (1.21.x, ubuntu-latest)	7m 56s
test-prev (1.20.x, windows-2019)	11m 2s
test-tip (macos-latest)	16m 50s
test-prev (1.20.x, macos-latest)	10m 8s
test-current-cov (1.21.x, windows-2019)	16m 2s
test-current-cov (1.21.x, macos-latest)	13m 23s
	1h 42m 40s

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