MI docs: remove historic note

[Vladimir Prus <vladimir at codesourcery dot com>]

The section of manual that talks about MI variable objects starts by some
texts that looks more like email message than documentation, and does not 
say anything important. I recall I was absolutely buffled when I first saw 
this section. It seems this section appeared there historically, but no 
longer is needed.

This patch removes that text. Now section on variable object starts with 
explanation what is variable object -- which looks quite reasonable.

OK?

- Volodya

        * gdb.texinfo (Motivation for Variable Objects in GDB/MI): 
        Remove.


=== gdb/doc/gdb.texinfo
==================================================================
--- gdb/doc/gdb.texinfo	(/mirrors/gdb_mainline)	(revision 2104)
+++ gdb/doc/gdb.texinfo	(/patches/gdb/remove_historic_note/gdb_mainline)	(revision 2104)
@@ -19482,40 +19482,6 @@
 @node GDB/MI Variable Objects
 @section @sc{gdb/mi} Variable Objects
 
-
-@subheading Motivation for Variable Objects in @sc{gdb/mi}
-
-For the implementation of a variable debugger window (locals, watched
-expressions, etc.), we are proposing the adaptation of the existing code
-used by @code{Insight}.
-
-The two main reasons for that are:
-
-@enumerate 1
-@item
-It has been proven in practice (it is already on its second generation).
-
-@item
-It will shorten development time (needless to say how important it is
-now).
-@end enumerate
-
-The original interface was designed to be used by Tcl code, so it was
-slightly changed so it could be used through @sc{gdb/mi}.  This section
-describes the @sc{gdb/mi} operations that will be available and gives some
-hints about their use.
-
-@emph{Note}: In addition to the set of operations described here, we
-expect the @sc{gui} implementation of a variable window to require, at
-least, the following operations:
-
-@itemize @bullet
-@item @code{-gdb-show} @code{output-radix}
-@item @code{-stack-list-arguments}
-@item @code{-stack-list-locals}
-@item @code{-stack-select-frame}
-@end itemize
-
 @subheading Introduction to Variable Objects in @sc{gdb/mi}
 
 @cindex variable objects in @sc{gdb/mi}