Say "manual page", not "man page", when referring to the Unix manual.

Doc/lib/libsocket.tex

@@ -372,7 +372,7 @@ block until they can proceed.
 \end{methoddesc}
 
 \begin{methoddesc}[socket]{setsockopt}{level, optname, value}
-Set the value of the given socket option (see the \UNIX{} man page
+Set the value of the given socket option (see the \UNIX{} manual page
 \manpage{setsockopt}{2}).  The needed symbolic constants are defined in
 the \module{socket} module (\code{SO_*} etc.).  The value can be an
 integer or a string representing a buffer.  In the latter case it is