fix: clarify that Lean's core library uses classical logic #117
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This pull request responds to the request from Bulhwi Cha to clarify that Lean's core library is not committed to avoiding classical:
https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/constructive.20tactic.20mode.20in.20lean/near/431736331
The previous wording dates back to the early days of the Lean project and is no longer accurate.