Remove a few merged versionadded/changed.
diff --git a/Doc/library/csv.rst b/Doc/library/csv.rst
index 5e1bd1e..bcda1bd 100644
--- a/Doc/library/csv.rst
+++ b/Doc/library/csv.rst
@@ -121,13 +121,9 @@
.. function:: get_dialect(name)
- Return the dialect associated with *name*. An :exc:`Error` is raised if *name*
- is not a registered dialect name.
-
- .. versionchanged:: 2.5
- This function now returns an immutable :class:`Dialect`. Previously an
- instance of the requested dialect was returned. Users could modify the
- underlying class, changing the behavior of active readers and writers.
+ Return the dialect associated with *name*. An :exc:`Error` is raised if
+ *name* is not a registered dialect name. This function returns an immutable
+ :class:`Dialect`.
.. function:: list_dialects()