Fix syntax error in an example in the ast documentation and sync docstrings (GH-18946)

(cherry picked from commit c00c86b904)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

Doc/library/ast.rst

@@ -308,7 +308,7 @@ and classes for traversing abstract syntax trees:
                   value=Name(id='data', ctx=Load()),
                   slice=Index(value=Constant(value=node.id)),
                   ctx=node.ctx
-              ), node)
+              )
 
    Keep in mind that if the node you're operating on has child nodes you must
    either transform the child nodes yourself or call the :meth:`generic_visit`

Lib/ast.py

@@ -408,11 +408,11 @@ class NodeTransformer(NodeVisitor):
        class RewriteName(NodeTransformer):
 
            def visit_Name(self, node):
-               return copy_location(Subscript(
+               return Subscript(
                    value=Name(id='data', ctx=Load()),
                    slice=Index(value=Str(s=node.id)),
                    ctx=node.ctx
-               ), node)
+               )
 
     Keep in mind that if the node you're operating on has child nodes you must
     either transform the child nodes yourself or call the :meth:`generic_visit`