Changed :module: to :mod: in docs/Validator.txt

Hi

I wanted the formencode documentation for offline viewing so I did a
checkout on the trunk and built the docs.

After building the docs and fixing the :mod: problem I realized my
local docs looks more completed then what's on the website.

Regards,

Ludolph Neethling

Index: docs/Validator.txt
===================================================================
--- docs/Validator.txt  (revision 3906)
+++ docs/Validator.txt  (working copy)
@@ -115,7 +115,7 @@

 There's lots of validators.  The best way to read about the individual
 validators available in the ``formencode.validators`` module is to
-read about :module:`formencode.validators`.
+read about :mod:`formencode.validators`.

 Compound Validators
 -------------------
@@ -577,7 +577,7 @@
 HTML forms, however, do not produce nested structures -- they produce
 flat structures with keys (input names) and associated values.

-Validator includes the module :module:`formencode.variabledecode`,
+Validator includes the module :mod:`formencode.variabledecode`,
 which allows you to encode nested dictionary and list structures into
 a flat dictionary.

------------------------------------------------------------------------------
Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT 
is a gathering of tech-side developers & brand creativity professionals. Meet
the minds behind Google Creative Lab, Visual Complexity, Processing, & 
iPhoneDevCamp as they present alongside digital heavyweights like Barbarian 
Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com