doc: users guide: chapter order adjusted

network-autoconfig: brought forward just in front of routing
queueing: pushed back to near diffserv

Author: avarga

doc/src/users-guide/index.rst

@@ -20,14 +20,15 @@ extend INET with new protocols or other components using C++, the
    ch-networks
    ch-network-nodes
    ch-network-interfaces
-   ch-queueing
    ch-apps
    ch-transport
    ch-ipv4
    ch-ipv6
    ch-other-network-protocols
+   ch-network-autoconfig
    ch-routing
    ch-adhoc-routing
+   ch-queueing
    ch-diffserv
    ch-mpls
    ch-ppp
@@ -44,7 +45,6 @@ extend INET with new protocols or other components using C++, the
    ch-mobility
    ch-power
    ch-emulation
-   ch-network-autoconfig
    ch-scenario-scripting
    ch-lifecycle
    ch-packetfilter