virNetworkGetDHCPLeases: fix docstring format

The docstring of virNetworkGetDHCPLeases is not correctly formatted and
as a result the example code snippet appears as normal text under the
"Returns:" section. This patch fixes the problem.
Signed-off-by: NIlias Stamatis <stamatis.iliass@gmail.com>

src/libvirt-network.c

@@ -1156,8 +1156,7 @@ virConnectNetworkEventDeregisterAny(virConnectPtr conn,
  * lease info about a specific guest interface with @mac. There can be
  * multiple leases for a single @mac because this API supports DHCPv6 too.
  *
- * Returns the number of leases found or -1 and sets @leases to NULL in
- * case of error. On success, the array stored into @leases is guaranteed to
+ * On success, the array stored into @leases is guaranteed to
  * have an extra allocated element set to NULL but not included in the return
  * count, to make iteration easier. The caller is responsible for calling
  * virNetworkDHCPLeaseFree() on each array element, then calling free() on @leases.
@@ -1192,6 +1191,9 @@ virConnectNetworkEventDeregisterAny(virConnectPtr conn,
  *
  *   free(leases);
  *
+ * Returns the number of leases found or -1 and sets @leases to NULL in
+ * case of error.
+ *
  */
 int
 virNetworkGetDHCPLeases(virNetworkPtr network,