[3979] Removed lease expiration from the server limitations.

doc/guide/dhcp4-srv.xml

@@ -3115,14 +3115,6 @@ It is merely echoed by the server
           <listitem>
             <simpara>Address duplication report (DECLINE) is not supported yet.</simpara>
           </listitem>
-          <listitem>
-            <simpara>
-              The server doesn't act upon expired leases. In particular,
-              when a lease expires, the server doesn't request the removal
-              of the DNS records associated with it. Expired leases can be
-              recycled.
-            </simpara>
-          </listitem>
       </itemizedlist>
     </section>
 

doc/guide/dhcp6-srv.xml

@@ -3115,14 +3115,6 @@ should include options from the isc option space:
             not yet supported.
           </simpara>
         </listitem>
-
-        <listitem>
-          <simpara>
-            The server doesn't act upon expired leases. In particular,
-            when a lease expires, the server doesn't request removal of
-            the DNS records associated with it.
-          </simpara>
-        </listitem>
       </itemizedlist>
     </section>