tests

Mention that type-stubs need to be contained in a package directory. #5759

Job	Run time
collateral (diffcov)	6m 23s
test_cygwin (39, windows-latest)	18m 40s
collateral (docs)	1m 50s
test (3.9, ubuntu-latest)	1m 30s
test (3.9, macos-latest)	1m 34s
test (3.9, windows-latest)	1m 13s
test (3.13, ubuntu-latest)	1m 30s
test (3.13, macos-latest)	1m 38s
test (3.13, windows-latest)	1m 23s
test (3.10, ubuntu-latest)	1m 32s
test (3.11, ubuntu-latest)	1m 32s
test (3.12, ubuntu-latest)	1m 30s
test (3.14, ubuntu-latest)	1m 30s
test (pypy3.10, ubuntu-latest, stdlib)	1m 29s
test (ubuntu-latest, 3.10, stdlib)	1m 31s
test (3.8, macos-13)	1m 13s
integration-test	0s
check	1s
release	0s
	45m 59s

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