bug#6344: 24.0.50; doc of menu separators

[Drew Adams]

emacs -Q
 
C-h i, Elisp manual.
 
Node `Extended Menu Items' says only this about separators:
 
"A string starting with two or more dashes specifies a separator line;
see *Note Menu Separators::."
 
Node `Menu Separators' says, likewise, that this is all that is
permitted: (menu-item SEPARATOR-TYPE)
 
A user will naturally wonder, "Is there no way to specify :enable or
:visible for a menu separator?"
 
In fact, there is a way, simply use:

 (menu-item SEPARATOR-TYPE nil :visible PREDICATE)

etc.
 
In sum, the doc (spec) for separators is incomplete.
 

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-05-23 on G41R2F1
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags -Ic:/xpm/include'