{classdesc} environment: Index as "Foo (class in foolib)" instead of

	"Foo (in module foolib)".  Is now independent of indexsubitem.

Doc/texinputs/python.sty

@@ -381,7 +381,7 @@
   \renewcommand{\@thisclass}{#1}%
   \begin{fulllineitems}%
     \item[\code{\bfcode{#1}(\varvars{#2})}]%
-    \ttindex{#1}%
+    \withsubitem{(class in \@thismodule)}{\ttindex{#1}}%
     \def\baseclasses##1{}%
 }{\end{fulllineitems}}