R devel - Mar 2022 - ?gettext on NULL as domain argument

In gettext.Rd in current (r81999) R devel
(https://svn.r-project.org/R/trunk/src/library/base/man/gettext.Rd) or R 4.2.0
alpha
(https://svn.r-project.org/R/branches/R-4-2-branch/src/library/base/man/gettext.Rd),
description of 'domain' argument is
the 'domain' for the translation, a character string, or NULL to flush
the cache; see 'Details'.

Describing domain = NULL as "to flush the cache" is partly wrong
because it applies only to function 'bindtextdomain'. It doesn't
apply to functions 'gettext' and 'ngettext' that are also
documented by gettext.Rd and also have 'domain' argument. In
'gettext' or 'ngettext', domain = NULL is the default and means
that domain is inferred.