[3.11] gh-116535: Fix distracting "TypeError" in example code (gh-116538) (gh-116552)

gh-116535: Fix distracting "TypeError" in example code (gh-116538)
(cherry picked from commit db8f423f58)

Co-authored-by: Declan <5962877+dec1@users.noreply.github.com>

Doc/library/dataclasses.rst

@@ -712,7 +712,7 @@ Using dataclasses, *if* this code was valid::
   class D:
       x: list = []      # This code raises ValueError
       def add(self, element):
-          self.x += element
+          self.x.append(element)
 
 it would generate code similar to::
 
@@ -721,7 +721,7 @@ it would generate code similar to::
       def __init__(self, x=x):
           self.x = x
       def add(self, element):
-          self.x += element
+          self.x.append(element)
 
   assert D().x is D().x