Add documentation on the hasfree data object.

Author: freddrake

Doc/lib/libdis.tex

@@ -85,6 +85,10 @@ \section{\module{dis} ---
 Sequence of byte codes that have a constant parameter.
 \end{datadesc}
 
+\begin{datadesc}{hasfree}
+Sequence of byte codes that access a free variable.
+\end{datadesc}
+
 \begin{datadesc}{hasname}
 Sequence of byte codes that access an attribute by name.
 \end{datadesc}