Fix docstring to be valid reST. #812

Job	Run time
Test docker image on ubuntu-latest	1m 52s
Test docker image on ubuntu-latest	1m 52s
Test docker image on ubuntu-latest	1m 52s
test-package (3.7)	4m 35s
test-package (3.7)	4m 35s
test-package (3.7)	5m 17s
test-package (3.9)	4m 22s
test-package (3.9)	4m 22s
test-package (3.9)	3m 53s
test-package (3.10)	3m 45s
test-package (3.10)	3m 45s
test-package (3.10)	3m 45s
test-package (3.11)	4m 21s
test-package (3.11)	4m 21s
test-package (3.11)	3m 41s
test-package (3.12)	4m 16s
test-package (3.12)	3m 59s
test-package (3.12)	3m 59s
	1h 8m 32s

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