[Rd] Two small fixes for WRE

[Martin Maechler]

>>>>> Ivan Krylov 
>>>>>     on Tue, 1 Sep 2026 12:21:14 +0300 writes:

    > There is one unintended use of \R instead of @R{}, and the prototype of
    > Rf_acopy_string needs a small fix:

    > Index: doc/manual/R-exts.texi
    > ===================================================================
    > --- doc/manual/R-exts.texi	(revision 90457)
    > +++ doc/manual/R-exts.texi	(working copy)
    > @@ -15492,7 +15492,7 @@
    > @c @apifun Free
    > @c The R_ forms were introduced in 2016-09, hence for R 3.4.0
    > Historically the macros @code{Calloc}, @code{Free} and @code{Realloc}
    > -were used but have been removed in \R 4.5.0.
    > +were used but have been removed in @R{} 4.5.0.
 
    > @code{R_Calloc}, @code{R_Realloc}, and @code{R_Free} are currently
    > implemented as macros expanding to calls to @code{R_chk_calloc},
    > @@ -17044,7 +17044,7 @@
    > @end deftypefun
 
    > @eapifun Rf_acopy_string
    > - using deftypefun {const char *} Rf_acopy_string (const char *@var{in})
    > + using deftypefun {char *} Rf_acopy_string (const char *@var{in})
    > Return a copy of a string using memory from @code{R_alloc}.
    > @end deftypefun

Thank you, Ivan.
I've committed these to R-devel, svn r90461, now.

Martin