Get rid of the remaining versionadded/versionchanged directives.
diff --git a/Doc/library/nis.rst b/Doc/library/nis.rst
index 77684bf..1281e3f 100644
--- a/Doc/library/nis.rst
+++ b/Doc/library/nis.rst
@@ -26,9 +26,8 @@
 
    Note that *mapname* is first checked if it is an alias to another name.
 
-   .. versionchanged:: 2.5
-      The *domain* argument allows to override the NIS domain used for the lookup. If
-      unspecified, lookup is in the default NIS domain.
+   The *domain* argument allows to override the NIS domain used for the lookup. If
+   unspecified, lookup is in the default NIS domain.
 
 
 .. function:: cat(mapname[, domain=default_domain])
@@ -39,29 +38,25 @@
 
    Note that *mapname* is first checked if it is an alias to another name.
 
-   .. versionchanged:: 2.5
-      The *domain* argument allows to override the NIS domain used for the lookup. If
-      unspecified, lookup is in the default NIS domain.
+   The *domain* argument allows to override the NIS domain used for the lookup. If
+   unspecified, lookup is in the default NIS domain.
 
 
 .. function:: maps([domain=default_domain])
 
    Return a list of all valid maps.
 
-   .. versionchanged:: 2.5
-      The *domain* argument allows to override the NIS domain used for the lookup. If
-      unspecified, lookup is in the default NIS domain.
+   The *domain* argument allows to override the NIS domain used for the lookup. If
+   unspecified, lookup is in the default NIS domain.
 
 
 .. function:: get_default_domain()
 
    Return the system default NIS domain.
 
-   .. versionadded:: 2.5
 
 The :mod:`nis` module defines the following exception:
 
-
 .. exception:: error
 
    An error raised when a NIS function returns an error code.