chore: cli help text: comma-separate alternative option forms #4911
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The help message of Lean command line contains
This may lead to misunderstanding that the command needs both argument
--o=onameand-o, i. e.lean --o=test.o -o test.lean. In the help message of GNU coreutils, such asls, it is-a, --all ..., which might be better.Some discussion is on Zulip thread https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/The.20help.20message.20of.20Lean.20command.20line.