Revert "Minor doc improvement (GH-10341)" (GH-12597)

This reverts commit dfd775a0b1aee51d842b20cdebd97cc52c0b32e7.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 8d53e68..64de970 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -971,7 +971,7 @@
     >>> getattr(p, 'x')
     11
 
-To convert a dictionary to a named tuple, use the ``**`` operator
+To convert a dictionary to a named tuple, use the double-star-operator
 (as described in :ref:`tut-unpacking-arguments`):
 
     >>> d = {'x': 11, 'y': 22}