Added a \versionadded statement to the getfqdn() description.

Doc/lib/libsocket.tex

@@ -109,6 +109,7 @@ host.  To find the fully qualified name, the hostname returned by
 available.  The first name which includes a period is selected.  In
 case no fully qualified domain name is available, the hostname is
 returned.
+\versionadded{2.0}
 \end{funcdesc}
 
 \begin{funcdesc}{gethostbyname}{hostname}