Update Mathlib/Data/Sym/Sym2.lean

Co-authored-by: Yaël Dillies <[email protected]>

Mathlib/Data/Sym/Sym2.lean

@@ -408,7 +408,7 @@ def pmap {P : α → Prop} (f : ∀ a, P a → β) (s : Sym2 α) : (∀ a ∈ s,
 
 /--
 "Attach" a proof `P a` that holds for all the elements of `s` to produce a new Sym2 object
-  with the same elements but in the type `{x // P x}`.
+with the same elements but in the type `{x // P x}`.
 -/
 def attachWith (s : Sym2 α) (P : α → Prop) (f : ∀ a ∈ s, P a) : Sym2 {a // P a} :=
   pmap Subtype.mk s f