Added description of socket_type.

Doc/lib/libsocket.tex

@@ -162,6 +162,11 @@ host byte order is the same as the network byte order, they are no-ops
 perform 2-byte or 4-byte swap operations.
 \end{funcdesc}
 
+\begin{datadesc}{socket_type}
+This is a Python type object that represents the socket object type.
+It is the same as \code{type(socket.socket(...))}.
+\end{datadesc}
+
 \subsection{Socket Objects}
 
 \noindent

Doc/libsocket.tex

@@ -162,6 +162,11 @@ host byte order is the same as the network byte order, they are no-ops
 perform 2-byte or 4-byte swap operations.
 \end{funcdesc}
 
+\begin{datadesc}{socket_type}
+This is a Python type object that represents the socket object type.
+It is the same as \code{type(socket.socket(...))}.
+\end{datadesc}
+
 \subsection{Socket Objects}
 
 \noindent