Make internal module references hyperlinks wherever it makes sense.
diff --git a/Doc/lib/librexec.tex b/Doc/lib/librexec.tex
index a7e8913..1c4c77c 100644
--- a/Doc/lib/librexec.tex
+++ b/Doc/lib/librexec.tex
@@ -1,7 +1,7 @@
\section{\module{rexec} ---
- Basic restricted execution framework.}
-\declaremodule{standard}{rexec}
+ Restricted execution framework}
+\declaremodule{standard}{rexec}
\modulesynopsis{Basic restricted execution framework.}
@@ -26,7 +26,7 @@
\var{hooks} is an instance of the \class{RHooks} class or a subclass of it.
If it is omitted or \code{None}, the default \class{RHooks} class is
instantiated.
-Whenever the \module{RExec} module searches for a module (even a
+Whenever the \module{rexec} module searches for a module (even a
built-in one) or reads a module's code, it doesn't actually go out to
the file system itself. Rather, it calls methods of an \class{RHooks}
instance that was passed to or created by its constructor. (Actually,
@@ -85,7 +85,7 @@
\begin{memberdesc}{ok_posix_names}
% Should this be called ok_os_names?
-Contains the names of the functions in the \module{os} module which will be
+Contains the names of the functions in the \refmodule{os} module which will be
available to programs running in the restricted environment. The
value for \class{RExec} is \code{('error',} \code{'fstat',}
\code{'listdir',} \code{'lstat',} \code{'readlink',} \code{'stat',}
@@ -95,7 +95,7 @@
\end{memberdesc}
\begin{memberdesc}{ok_sys_names}
-Contains the names of the functions and variables in the \module{sys}
+Contains the names of the functions and variables in the \refmodule{sys}
module which will be available to programs running in the restricted
environment. The value for \class{RExec} is \code{('ps1',}
\code{'ps2',} \code{'copyright',} \code{'version',} \code{'platform',}