fix comment slash hiccup #1182

Job	Run time
tests-Windows-CLI (mingw64, x86_64, 3.8)	21m 45s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 0s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	20m 32s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	5m 57s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	9m 32s
canceller	5s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 21s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	9m 24s
tests-Unix-GUI (macos-12, 5.9.5)	6m 36s
tests-Windows-GUI (mingw64, x86_64)	12m 40s
tests-Unix-CLI (macos-12, 3.8)	13m 41s
tests-Unix-GUI (macos-13, 5.15.2)	8m 28s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	12m 53s
tests-Unix-CLI (macos-13, 3.9)	13m 4s
tests-windows-latest-pacman (mingw64, x86_64)	2m 6s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	2m 1s
	2h 30m 5s

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