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Document how a handler deals with cancellation #4429

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	44s
checks / docs	1m 20s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, windows-latest)	2m 9s
checks / test (3.11, locked, ubuntu-latest)	1m 31s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 35s
checks / test (3.10, locked, ubuntu-latest)	1m 50s
checks / test (3.12, locked, ubuntu-latest)	1m 57s
checks / test (3.14, locked, windows-latest)	1m 54s
checks / test (3.13, locked, ubuntu-latest)	1m 18s
checks / test (3.10, lowest-direct, windows-latest)	3m 0s
checks / test (3.11, locked, windows-latest)	1m 52s
checks / test (3.13, locked, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 30s
checks / test (3.13, lowest-direct, windows-latest)	2m 3s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.12, lowest-direct, windows-latest)	2m 16s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 37s
checks / test (3.14, locked, ubuntu-latest)	1m 42s
checks / test (3.12, locked, windows-latest)	2m 5s
checks / test (3.14, lowest-direct, windows-latest)	2m 23s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
all-green	4s
	40m 42s