Remove extra period at end.

Doc/lib/libsocket.tex

@@ -69,7 +69,7 @@ configuration.  For deterministic behavior use a numeric address in
 \var{host} portion.
 
 \versionadded[2.5]{AF_NETLINK sockets are represented as 
-pairs \code{\var{pid}, \var{groups}}.}
+pairs \code{\var{pid}, \var{groups}}}
 
 All errors raise exceptions.  The normal exceptions for invalid
 argument types and out-of-memory conditions can be raised; errors