Some fixes (&->\&, _->\_) to remove latex complaints.

Actually the whole point of this excercise was to try to make a nice pdf file
with contents tree and thumbnail pages using pdflatex, but it keeps depleting
tex's resources :-(


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5884 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/menu.tex

@@ -502,7 +502,7 @@ menu bar.}
 
 \docparam{titles}{An array of title strings. Deallocate this array after creating the menu bar.}
 
-\docparam{style}{If {\tt wxMB_DOCKABLE} the menu bar can be detached (wxGTK only).}
+\docparam{style}{If {\tt wxMB\_DOCKABLE} the menu bar can be detached (wxGTK only).}
 
 \pythonnote{Only the default constructor is supported in wxPython.
 Use wxMenuBar.Append instead.}