Make no assumption about how modules are built when referring to them; this
can vary by platform and installation.
Based on suggestion to python-docs.
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex
index 8a8125d..2b87159 100644
--- a/Doc/lib/libstdtypes.tex
+++ b/Doc/lib/libstdtypes.tex
@@ -791,10 +791,9 @@
point values on a particular machine.
} All other errors raise exceptions.
-Additional string operations are defined in standard module
-\refmodule{string} and in built-in module \refmodule{re}.
-\refstmodindex{string}
-\refstmodindex{re}
+Additional string operations are defined in standard modules
+\refmodule{string}\refstmodindex{string} and
+\refmodule{re}.\refstmodindex{re}
\subsubsection{XRange Type \label{typesseq-xrange}}