Remove list of pickle protocol names used by the copy module; there

are enough subtleties to pickling that we don't want misunderstanding
to spread because we don't provide all the information twice.  The
reference to the pickle module for information will have to suffice;
at least only one portion of the docs will be out of date.  ;-(

Doc/lib/libcopy.tex

@@ -72,14 +72,10 @@ stack trace, stack frame, file, socket, window, array, or any similar
 types.
 
 Classes can use the same interfaces to control copying that they use
-to control pickling: they can define methods called
-\method{__getinitargs__()}, \method{__getstate__()} and
-\method{__setstate__()}.  See the description of module
+to control pickling.  See the description of module
 \refmodule{pickle}\refstmodindex{pickle} for information on these
 methods.  The \module{copy} module does not use the
 \refmodule[copyreg]{copy_reg} registration module.
-\withsubitem{(copy protocol)}{\ttindex{__getinitargs__()}
-  \ttindex{__getstate__()}\ttindex{__setstate__()}}
 
 In order for a class to define its own copy implementation, it can
 define special methods \method{__copy__()} and