Fix documentation of Crypto.Hash.CMAC.CMAC.hexverify #769

Job	Run time
test_c_linux (0, x64)	1m 40s
mypy	21s
test_c_linux (0, x32)	1m 38s
build (3.5, yes, ubuntu-20.04)	2m 53s
test_c_linux (1, x64)	1m 52s
test_c_linux (1, x32)	1m 58s
build_python_27 (ubuntu-20.04, yes)	3m 50s
build (3.5, no, ubuntu-20.04)	2m 45s
build_python_27 (ubuntu-20.04, no)	3m 13s
build (3.6, yes, ubuntu-20.04)	2m 46s
build_python_27 (windows-latest, yes)	6m 15s
build (3.6, no, ubuntu-20.04)	2m 55s
test_c_windows (x64)	1m 26s
build_python_27 (windows-latest, no)	5m 40s
build (3.7, yes, ubuntu-20.04)	3m 19s
test_c_windows (win32)	1m 15s
build (3.7, no, ubuntu-20.04)	2m 38s
build (3.8, yes, ubuntu-20.04)	3m 11s
build (3.8, no, ubuntu-20.04)	2m 27s
build (3.9, yes, ubuntu-20.04)	2m 47s
build (3.9, no, ubuntu-20.04)	2m 35s
build (3.10, yes, ubuntu-20.04)	3m 13s
build (3.10, no, ubuntu-20.04)	3m 0s
build (3.11, yes, ubuntu-20.04)	2m 53s
build (3.11, no, ubuntu-20.04)	2m 15s
build (3.12-dev, yes, ubuntu-20.04)	3m 0s
build (3.12-dev, no, ubuntu-20.04)	2m 18s
build (3.11, yes, macos-12)	2m 51s
build (3.11, no, windows-latest)	6m 22s
build (3.11, yes, windows-latest)	6m 1s
build (3.12-dev, no, windows-latest)	5m 38s
build (3.12-dev, yes, windows-latest)	6m 25s
build (pypy2.7, no, ubuntu-latest)	1m 43s
build (pypy3.9, no, ubuntu-latest)	2m 37s
	1h 45m 40s

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