man: list short/long opt on same line

man: list short/long opt on same line

With earlier commit, I attempted to keep them on separate lines for
somewhat dubious reasons. In practise that didn't work and they stayed
on the same line, while also dropping the separating comma.

Looking back, it would be better to fix the vim manpager mode issues
rather than mask it. Mea culpa

Effectively this reverts commit e7626810fd0f34db2c205b86ff6ad6cf42794fa7

Reference: https://lore.kernel.org/linux-modules/ZvknyLKvQeBo16n9@meinfjell.helgefjelltest.de
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/164
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>