Issue3950: Fix docs for default locale used by gettext to match imple…

…mentation (GH-18435)

documentation for default locale directory Doc/library/gettext.rst changed to match gettext implementation line 63.
(cherry picked from commit d68e0a8)

Co-authored-by: Carl <Carl-Ty@users.noreply.github.com>

Doc/library/gettext.rst

@@ -724,8 +724,8 @@ implementations, and valuable experience to the creation of this module:
 .. [#] The default locale directory is system dependent; for example, on RedHat Linux
    it is :file:`/usr/share/locale`, but on Solaris it is :file:`/usr/lib/locale`.
    The :mod:`gettext` module does not try to support these system dependent
-   defaults; instead its default is :file:`{sys.prefix}/share/locale` (see
-   :data:`sys.prefix`). For this reason, it is always best to call
+   defaults; instead its default is :file:`{sys.base_prefix}/share/locale` (see
+   :data:`sys.base_prefix`). For this reason, it is always best to call
    :func:`bindtextdomain` with an explicit absolute path at the start of your
    application.