bpo-30659 : Use ** for kwargs in namedtuple._replace() signature (GH-2173) (GH-2197)

(cherry picked from commit 184bd82)

Author: Mariatta

Doc/library/collections.rst

@@ -855,7 +855,7 @@ field names, the method and attribute names start with an underscore.
     .. versionchanged:: 3.1
         Returns an :class:`OrderedDict` instead of a regular :class:`dict`.
 
-.. method:: somenamedtuple._replace(kwargs)
+.. method:: somenamedtuple._replace(**kwargs)
 
     Return a new instance of the named tuple replacing specified fields with new
     values::