B2 path in help fix #1147

Job	Run time
lint	40s
build	34s
cleanup_buckets	19s
test-linux-bundle	8m 23s
test (ubuntu-latest, 3.7)	8m 55s
test-windows-bundle (windows-2019)	9m 39s
test (ubuntu-latest, 3.8)	1m 7s
test-windows-bundle (windows-latest)	10m 34s
test (ubuntu-latest, 3.9)	1m 7s
test-docker	28m 48s
test (ubuntu-latest, 3.10)	1m 15s
test (ubuntu-latest, 3.11)	1m 1s
test (ubuntu-latest, 3.12)	20m 23s
test (ubuntu-latest, pypy3.9)	3m 33s
test (ubuntu-latest, pypy3.10)	16m 5s
test (macos-latest, 3.7)	9m 0s
test (macos-latest, 3.8)	1m 19s
test (macos-latest, 3.9)	2m 3s
test (macos-latest, 3.10)	1m 18s
test (macos-latest, 3.11)	1m 35s
test (macos-latest, 3.12)	22m 59s
test (macos-latest, pypy3.9)	3m 31s
test (windows-latest, 3.7)	13m 15s
test (windows-latest, 3.8)	1m 27s
test (windows-latest, 3.9)	1m 30s
test (windows-latest, 3.10)	1m 53s
test (windows-latest, 3.11)	1m 47s
test (windows-latest, 3.12)	13m 8s
test (windows-latest, pypy3.9)	8m 17s
doc	1m 3s
	3h 16m 28s

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