Drafted 2.11 release notes. (#1004) #2535

Job	Run time
test-and-build (11, ubuntu-latest, ism)	22m 28s
test-and-build (11, ubuntu-latest, non-ism)	14m 33s
test-and-build (11, windows-latest, ism)	5m 25s
test-and-build (11, windows-latest, non-ism)	5m 1s
test-and-build (11, macos-latest, ism)	5m 42s
test-and-build (11, macos-latest, non-ism)	6m 21s
test-and-build (17, ubuntu-latest, ism)	22m 39s
test-and-build (17, ubuntu-latest, non-ism)	15m 57s
test-and-build (17, windows-latest, ism)	5m 29s
test-and-build (17, windows-latest, non-ism)	5m 29s
test-and-build (17, macos-latest, ism)	6m 59s
test-and-build (17, macos-latest, non-ism)	7m 21s
	2h 3m 24s

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