Fix docs that imply that tuples in except clauses must be parenthesized.

Doc/tutorial/errors.rst

@@ -115,9 +115,9 @@ A :keyword:`try` statement may have more than one except clause, to specify
 handlers for different exceptions.  At most one handler will be executed.
 Handlers only handle exceptions that occur in the corresponding try clause, not
 in other handlers of the same :keyword:`try` statement.  An except clause may
-name multiple exceptions as a parenthesized tuple, for example::
+name multiple exceptions as a tuple, for example::
 
-   ... except (RuntimeError, TypeError, NameError):
+   ... except RuntimeError, TypeError, NameError:
    ...     pass
 
 The last except clause may omit the exception name(s), to serve as a wildcard.