pythongh-82180: Document support for non-integer arg removed from grp…

….getgrgid in 3.10 (pythonGH-95346)

(cherry picked from commit 50bf5fa)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Doc/library/grp.rst

@@ -45,9 +45,8 @@ It defines the following items:
    Return the group database entry for the given numeric group ID. :exc:`KeyError`
    is raised if the entry asked for cannot be found.
 
-   .. deprecated:: 3.6
-      Since Python 3.6 the support of non-integer arguments like floats or
-      strings in :func:`getgrgid` is deprecated.
+   .. versionchanged:: 3.10
+      :exc:`TypeError` is raised for non-integer arguments like floats or strings.
 
 .. function:: getgrnam(name)