Updated \indexsubitem; functions had been indexed for the wrong module.

Doc/lib/librand.tex

@@ -8,6 +8,8 @@ given library's implementation.  While still supported for
 compatibility, the \code{rand} module is now considered obsolete; if
 possible, use the \code{whrandom} module instead.
 
+\renewcommand{\indexsubitem}{(in module rand)}
+
 \begin{funcdesc}{choice}{seq}
 Returns a random element from the sequence \var{seq}.
 \end{funcdesc}

Doc/librand.tex

@@ -8,6 +8,8 @@ given library's implementation.  While still supported for
 compatibility, the \code{rand} module is now considered obsolete; if
 possible, use the \code{whrandom} module instead.
 
+\renewcommand{\indexsubitem}{(in module rand)}
+
 \begin{funcdesc}{choice}{seq}
 Returns a random element from the sequence \var{seq}.
 \end{funcdesc}