Add commentstring to vim editor #452

Job	Run time
macos-latest.openmpi.python-3.12	3m 26s
ubuntu-latest.openmpi.python-3.12	11m 42s
windows-latest.msmpi.python-3.12	8m 29s
ubuntu-latest.mpich.python-3.12	11m 28s
macos-latest.mpich.python-3.12	3m 55s
	39m 0s

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