Adds docutils modules to lib index, fixes :idx: markers.

doc/lib.txt

@@ -255,6 +255,22 @@ Parsers
   This is a low level module that implements an extremely efficient buffering
   scheme for lexers and parsers. This is used by the diverse parsing modules.
 
+* `highlite <highlite.html>`_
+  Source highlighter for programming or markup languages.  Currently
+  only few languages are supported, other languages may be added.
+  The interface supports one language nested in another.
+
+* `rst <rst.html>`_
+  This module implements a reStructuredText parser. A large subset
+  is implemented. Some features of the markdown wiki syntax are
+  also supported.
+
+* `rstast <rstast.html>`_
+  This module implements an AST for the reStructuredText parser.
+
+* `rstgen <rstgen.html>`_
+  This module implements a generator of HTML/Latex from reStructuredText.
+
 
 XML Processing
 --------------