docs: fix connection pool close call (#1125) #570

Job	Run time
test-postgres (9.5)	4m 48s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 25s
test-postgres (9.6)	3m 59s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 31s
test-postgres (10)	3m 46s
test-platforms (3.8, macos-latest, asyncio)	3m 35s
test-postgres (11)	3m 53s
test-platforms (3.8, macos-latest, uvloop)	3m 40s
test-postgres (12)	3m 53s
test-platforms (3.8, windows-latest, asyncio)	5m 3s
test-postgres (13)	3m 53s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 25s
test-postgres (14)	3m 52s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 19s
test-postgres (15)	3m 49s
test-platforms (3.9, macos-latest, asyncio)	3m 12s
test-postgres (16)	4m 3s
test-platforms (3.9, macos-latest, uvloop)	3m 13s
test-platforms (3.9, windows-latest, asyncio)	5m 0s
test-platforms (3.10, ubuntu-latest, asyncio)	3m 19s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 22s
test-platforms (3.10, macos-latest, asyncio)	3m 30s
test-platforms (3.10, macos-latest, uvloop)	3m 19s
test-platforms (3.10, windows-latest, asyncio)	5m 21s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 15s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 20s
test-platforms (3.11, macos-latest, asyncio)	3m 16s
test-platforms (3.11, macos-latest, uvloop)	3m 27s
test-platforms (3.11, windows-latest, asyncio)	5m 4s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 34s
test-platforms (3.12, macos-latest, asyncio)	3m 11s
test-platforms (3.12, windows-latest, asyncio)	4m 38s
Regression Tests	1s
	2h 1m 56s

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