Remove various modules that have been documented

Doc/lib/libundoc.tex

@@ -15,10 +15,7 @@ Frameworks tend to be harder to document, but are well worth the
 effort spent.
 
 \begin{description}
-\item[\module{test}]
---- Regression testing framework.  This is used for the Python
-regression test, but is useful for other Python libraries as well.
-This is a package rather than a single module.
+\item None at this time.
 \end{description}
 
 
@@ -32,21 +29,10 @@ Some of these are very old and/or not very robust; marked with ``hmm.''
 
 \item[\module{ihooks}]
 --- Import hook support (for \refmodule{rexec}; may become obsolete).
-
-\item[\module{platform}]
---- This module tries to retrieve as much platform identifying data as
-possible.  It makes this information available via function APIs.
-If called from the command line, it prints the platform information
-concatenated as single string to \code{sys.stdout}.  The output format
-is useable as part of a filename.
-\versionadded{2.3}
-
-\item[\module{smtpd}]
---- An SMTP daemon implementation which meets the minimum requirements
-for \rfc{821} conformance.
 \end{description}
 
 
+
 \section{Platform specific modules}
 
 These modules are used to implement the \refmodule{os.path} module,