[3.12] pythongh-123621: Fix datamodel.rst with proper dict notation (pythonGH-123648) (python#123654)

pythongh-123621: Fix `datamodel.rst` with proper `dict` notation (pythonGH-123648)
(cherry picked from commit cfbc841)

Co-authored-by: Lipták Attila (Flash) <[email protected]>

Author: miss-islington

Doc/reference/datamodel.rst

@@ -496,7 +496,7 @@ in the same order they were added sequentially over the dictionary.
 Replacing an existing key does not change the order, however removing a key
 and re-inserting it will add it to the end instead of keeping its old place.
 
-Dictionaries are mutable; they can be created by the ``{...}`` notation (see
+Dictionaries are mutable; they can be created by the ``{}`` notation (see
 section :ref:`dict`).
 
 .. index::