doc(NumberTheory/Padics/PadicVal): typo (#11320)

Fix a typo.

Author: gaetanserre

Mathlib/NumberTheory/Padics/PadicVal.lean

@@ -72,7 +72,7 @@ open Rat
 open multiplicity
 
 /-- For `p ≠ 1`, the `p`-adic valuation of a natural `n ≠ 0` is the largest natural number `k` such
-that `p^k` divides `z`. If `n = 0` or `p = 1`, then `padicValNat p q` defaults to `0`. -/
+that `p^k` divides `n`. If `n = 0` or `p = 1`, then `padicValNat p q` defaults to `0`. -/
 def padicValNat (p : ℕ) (n : ℕ) : ℕ :=
   if h : p ≠ 1 ∧ 0 < n then (multiplicity p n).get (multiplicity.finite_nat_iff.2 h) else 0
 #align padic_val_nat padicValNat