CommandLine.h: fix typo (#902) #1570

Job	Run time
linux-coverage	12m 52s
bindings	22m 22s
conan	6m 55s
build (clang-sanitize, ubuntu-22.04)	33m 46s
build (gcc-release, ubuntu-22.04)	9m 56s
build (gcc-11-release, ubuntu-22.04)	8m 47s
build (gcc-debug-shared, ubuntu-22.04)	6m 46s
build (gcc-debug-noexcept, ubuntu-22.04)	7m 8s
build (macos-release, macos-13)	5m 40s
build (win64-release, windows-latest)	12m 34s
build (win64-debug-shared, windows-latest)	8m 19s
build (win64-debug-noexcept, windows-latest)	7m 57s
	2h 23m 2s

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