chore: remove whitespace (#25363)

Found by #24465,

Author: adomani

Mathlib/RingTheory/Radical.lean

@@ -125,7 +125,7 @@ lemma primeFactors_val_eq_normalizedFactors (ha : IsRadical a) :
   exact normalizedFactors_nodup ha
 
 -- Note that the non-zero assumptions are necessary here.
-theorem primeFactors_mul_eq_union [DecidableEq M] (ha : a ≠ 0) (hb : b ≠ 0)  :
+theorem primeFactors_mul_eq_union [DecidableEq M] (ha : a ≠ 0) (hb : b ≠ 0) :
     primeFactors (a * b) = primeFactors a ∪ primeFactors b := by
   ext p
   simp [mem_normalizedFactors_iff', mem_primeFactors, ha, hb]