Use cleanup_ctx in pool usage doc (#878) #480

Job	Run time
test-postgres (9.5)	3m 15s
test-postgres (9.6)	3m 54s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 41s
test-postgres (10)	3m 18s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 44s
test-postgres (11)	3m 1s
test-platforms (3.8, macos-latest, asyncio)	3m 7s
test-postgres (12)	3m 15s
test-platforms (3.8, macos-latest, uvloop)	3m 10s
test-postgres (13)	3m 50s
test-platforms (3.8, windows-latest, asyncio)	7m 15s
test-postgres (14)	3m 19s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 37s
test-postgres (15)	3m 40s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 30s
test-postgres (16)	4m 21s
test-platforms (3.9, macos-latest, asyncio)	2m 59s
test-platforms (3.9, macos-latest, uvloop)	3m 5s
test-platforms (3.9, windows-latest, asyncio)	6m 13s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 25s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 29s
test-platforms (3.10, macos-latest, asyncio)	2m 57s
test-platforms (3.10, macos-latest, uvloop)	3m 6s
test-platforms (3.10, windows-latest, asyncio)	6m 45s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 13s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 18s
test-platforms (3.11, macos-latest, asyncio)	3m 43s
test-platforms (3.11, macos-latest, uvloop)	3m 31s
test-platforms (3.11, windows-latest, asyncio)	6m 4s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 30s
test-platforms (3.12, macos-latest, asyncio)	4m 42s
test-platforms (3.12, windows-latest, asyncio)	6m 59s
Regression Tests	1s
	1h 57m 57s

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