lots of markup nits, most commonly Unix/unix --> \UNIX
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index bd496fe..c0aa238 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -258,14 +258,14 @@
\begin{itemize}
\item On Windows 9x, the encoding is ``mbcs''.
\item On Mac OS X, the encoding is ``utf-8''.
-\item On Unix, the encoding is the user's preference
- according to the result of nl_langinfo(CODESET), or None if
- the nl_langinfo(CODESET) failed.
+\item On \UNIX, the encoding is the user's preference
+ according to the result of nl_langinfo(CODESET), or \constant{None}
+ if the \code{nl_langinfo(CODESET)} failed.
\item On Windows NT+, file names are Unicode natively, so no conversion
- is performed. \code{getfilesystemencoding} still returns ``mbcs'',
- as this is the encoding that applications should use when they
- explicitly want to convert Unicode strings to byte strings that
- are equivalent when used as file names.
+ is performed. \function{getfilesystemencoding()} still returns
+ \code{'mbcs'}, as this is the encoding that applications should use
+ when they explicitly want to convert Unicode strings to byte strings
+ that are equivalent when used as file names.
\end{itemize}
\versionadded{2.3}
\end{funcdesc}