Improve the docstring of the expect macro #115

Job	Run time
Build and test (24.4)	29s
Build and test (24.5)	28s
Build and test (25.1)	27s
Build and test (25.2)	26s
Build and test (25.3)	25s
Build and test (26.1)	27s
Build and test (26.2)	26s
Build and test (26.3)	26s
Build and test (27.1)	27s
Build and test (28.1)	25s
Build and test (28.2)	26s
Build and test (29.1)	27s
Build and test (29.2)	38s
Build and test (29.3)	38s
Build and test (29.4)	36s
Build and test (release-snapshot)	34s
Build and test (snapshot)	25s
	8m 10s

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