[Merged by Bors] - feat(data/set/finite): complement of finite set is infinite #6266
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Add two missing lemmas. One-line proofs due to Yakov Pechersky.
Alternative names:
infinite_of_finite_compl
->infinite_of_compl_finite
andcompl_infinite_of_finite
->infinite_compl_of_finite
. Any comments? I went withthe "prefix notation order" as it were.