mention new module doc display feature of pydoc in libref and NEWS

Doc/lib/libpydoc.tex

@@ -60,3 +60,8 @@ environment and path to locate modules.  Thus, invoking
 \program{pydoc} \programopt{spam} documents precisely the version of
 the module you would get if you started the Python interpreter and
 typed \samp{import spam}.
+
+Module docs for core modules are assumed to reside in
+{}\url{http://www.python.org/doc/current/lib/}.  This can be overridden by
+setting the \envvar{PYTHONDOCS} environment variable to a different URL or
+to a local directory containing the Library Reference Manual pages.

Misc/NEWS

@@ -62,6 +62,11 @@ Library
 Tools/Demos
 -----------
 
+- The pydoc script will display a link to the module documentation for
+  modules determined to be part of the core distribution.  The documentation
+  base directory defaults to http://www.python.org/doc/current/lib/ but can
+  be changed by setting the PYTHONDOCS environment variable.
+
 - texcheck.py now detects double word errors.
 
 - md5sum.py mistakenly opened input files in text mode by default, a