style(Analysis/SpecialFunctions/FrullaniIntegral): tiny clean up

Author: Deep0Thinking

Mathlib/Analysis/SpecialFunctions/FrullaniIntegral.lean

@@ -22,14 +22,10 @@ integrability of the integrand.
 
 public section
 
-open Real Set Filter MeasureTheory intervalIntegral
-
-open scoped Topology
+open Real Set Filter MeasureTheory intervalIntegral Topology Metric
 
 namespace Frullani
 
-open Metric
-
 variable {E : Type*} [NormedAddCommGroup E] [NormedSpace ℝ E] {f : ℝ → E}
          {a b c : ℝ} {L R : E}