fix typos in PEP 635 (#1746)

pep-0635.rst

@@ -139,10 +139,10 @@ a JSON data structure using ``match``::
   match json_pet:
       case {"type": "cat", "name": name, "pattern": pattern}:
           return Cat(name, pattern)
-      case {"type": "dog", "name": name, "breed": breed):
+      case {"type": "dog", "name": name, "breed": breed}:
           return Dog(name, breed)
       case _:
-          raise ValueError("Not an suitable pet")
+          raise ValueError("Not a suitable pet")
 
 Functional programming generally prefers a declarative style with a focus
 on relationships in data.  Side effects are avoided whenever possible.