Fix Section 10.2 typos and redundant hypotheses#502
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Correct IsMaxOn/IsMinOn to IsLocalMaxOn/IsLocalMinOn in three examples where the local variants were intended. Remove redundant `hab: a < b` hypotheses from `deriv_eq_zero` lemmas and the `IsMaxOn` counterexample, since `x₀ ∈ Set.Ioo a b` (or `Set.Icc a b` with the existential) already implies `a ≤ b`.
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Correct IsMaxOn/IsMinOn to IsLocalMaxOn/IsLocalMinOn in three examples where the local variants were intended. Remove redundant
hab: a < bhypotheses fromderiv_eq_zerolemmas and theIsMaxOncounterexample, sincex₀ ∈ Set.Ioo a balready impliesa < b.