refactor: Remove double empty lines

HepLean/FlavorPhysics/CKMMatrix/Basic.lean

@@ -17,12 +17,10 @@ related by phase shifts.
 The notation `[V]ud` etc can be used for the elements of a CKM matrix, and
 `[V]ud|us` etc for the ratios of elements.
 
-
 -/
 
 open Matrix Complex
 
-
 noncomputable section
 
 /-- Given three real numbers `a b c` the complex matrix with `exp (I * a)` etc on the
@@ -107,7 +105,6 @@ lemma phaseShiftRelation_trans {U V W : unitaryGroup (Fin 3) ℂ} :
   rw [phaseShiftMatrix_mul]
   rw [add_comm k e, add_comm l f, add_comm m g]
 
-
 lemma phaseShiftRelation_equiv : Equivalence PhaseShiftRelation where
   refl := phaseShiftRelation_refl
   symm := phaseShiftRelation_symm
@@ -270,7 +267,6 @@ lemma tb (V : CKMMatrix) (a b c d e f : ℝ) :
 
 end phaseShiftApply
 
-
 /-- The aboslute value of the `(i,j)`th element of `V`. -/
 @[simp]
 def VAbs' (V : unitaryGroup (Fin 3) ℂ) (i j : Fin 3) : ℝ := Complex.abs (V i j)
@@ -341,11 +337,9 @@ abbrev VtsAbs := VAbs 2 1
 @[simp]
 abbrev VtbAbs := VAbs 2 2
 
-
 namespace CKMMatrix
 open ComplexConjugate
 
-
 section ratios
 
 /-- The ratio of the `ub` and `ud` elements of a CKM matrix. -/
@@ -394,7 +388,6 @@ lemma Rcscb_mul_cb {V : CKMMatrix} (h : [V]cb ≠ 0): [V]cs = Rcscb V * [V]cb :=
 
 end ratios
 
-
 end CKMMatrix
 
 end