texinfo manual index entries for @vindex etc

[Kevin Ryde]

It'd be good if the texinfo manual had entries for vindex and friends in
the "Command and Variable Index".

I tried Emacs info-lookup-symbol on @vindex, hoping it would go to a
relevant node, but that func needs an entry in the "Command and Variable
Index" for where.  Would it be as easy as below (untested!)?

--- texinfo.txi.~1.244.~        2009-05-11 07:31:01.000000000 +1000
+++ texinfo.txi 2009-10-17 09:49:21.000000000 +1100
@@ -9786,23 +9786,29 @@
 @table @samp
 @item cp
 @cindex @code{cp} (concept) index
address@hidden cindex
 (@code{@@cindex}) concept index, for general concepts.
 @item fn
 @cindex @code{fn} (function) index
address@hidden findex
 (@code{@@findex}) function index, for function and function-like
 names (such as entry points of libraries).
 @item ky
 @cindex @code{ky} (keystroke) index
address@hidden kindex
 (@code{@@kindex}) keystroke index, for keyboard commands.
 @item pg
 @cindex @code{pg} (program) index
address@hidden pindex
 (@code{@@pindex}) program index, for names of programs.
 @item tp
 @cindex @code{tp} (data type) index
address@hidden tindex
 (@code{@@tindex}) data type index, for type names (such as structures
 defined in header files).
 @item vr
 @cindex @code{vr} (variable) index
address@hidden vindex
 (@code{@@vindex}) variable index, for variable names (such as global
 variables of libraries).
 @end table