docs: clarify that the lean module is for lean3 #8278
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Lean 4 was released some time ago, so I was surprised to find the lean module installed lean3-mode. To avoid confusion, could we, at least for now, replace the cutesy message with a warning that the user is installing a mode for a deprecated language?
We could later add lean4 as a
lean4
module. I don't think it makes sense to complicate things by adding support for both Lean 4 and Lean 3 in the same module, because the Lean 3 is deprecated and going to become increasingly niche.Related: Lean 4 module, PR #7439