rtl is not in Elisp manual

[Drew Adams]

I'm trying to update my info.el extension library info+.el. I see, for
instance, that Info-clone-buffer-hook was renamed to
Info-clone-buffer.

A diff shows this kind of thing added to `info-tool-bar-map':

 :rtl "right-arrow"

I searched the Elisp manual for :rtl and rtl, but found
nothing. Shouldn't this be documented?


In GNU Emacs 22.1.90.1 (i386-mingw-nt5.1.2600)
 of 2008-01-30 on PRETEST
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -Ic:/gnuwin32/include'