Fix typo in ast.py (GH-25740)

parantheses -> parentheses

Author: eltociear

Lib/ast.py

@@ -1455,9 +1455,9 @@ def visit_Call(self, node):
 
     def visit_Subscript(self, node):
         def is_simple_tuple(slice_value):
-            # when unparsing a non-empty tuple, the parantheses can be safely
+            # when unparsing a non-empty tuple, the parentheses can be safely
             # omitted if there aren't any elements that explicitly requires
-            # parantheses (such as starred expressions).
+            # parentheses (such as starred expressions).
             return (
                 isinstance(slice_value, Tuple)
                 and slice_value.elts