Common: network gets more titles

also move around some wording below titles to make it consistent

common/source/docs/common-network.rst

@@ -36,7 +36,7 @@ Configuration
 Ethernet MAC Configuration
 --------------------------
 
-If the autopilot has an Ethernet MAC the following parameters apply:
+If the autopilot has an Ethernet MAC the following parameters apply.  This is the global 6 byte MAC address. The default is automatically generated from the autopilot's CPU unique id, but can be changed if desired.
 
 - :ref:`NET_MACADDR0<NET_MACADDR0>`
 - :ref:`NET_MACADDR1<NET_MACADDR1>`
@@ -45,22 +45,31 @@ If the autopilot has an Ethernet MAC the following parameters apply:
 - :ref:`NET_MACADDR4<NET_MACADDR4>`
 - :ref:`NET_MACADDR5<NET_MACADDR5>`
 
-This is the global 6 byte MAC address. The default is automatically generated from the autopilot's CPU unique id, but can be changed if desired.
+Autopilot IP address
+--------------------
 
-- :ref:`NET_IPADDR0<NET_IPADDR0>`
-- :ref:`NET_IPADDR1<NET_IPADDR1>`
-- :ref:`NET_IPADDR2<NET_IPADDR2>`
-- :ref:`NET_IPADDR3<NET_IPADDR3>`
+The following parameters holds the autopilot's 4 byte IP address.  It defaults to ``192.168.144.14``
 
-This is the autopilot's 4 byte IP address. It defaults to ``192.168.144.14``. It can be dynamically assigned if the network has a DHCP server by enabling ArduPilot's DHCP client using the :ref:`NET_DHCP<NET_DHCP>` parameter, or manually set as desired.
+- :ref:`NET_IPADDR0<NET_IPADDR0>` (e.g. 192)
+- :ref:`NET_IPADDR1<NET_IPADDR1>` (e.g. 168)
+- :ref:`NET_IPADDR2<NET_IPADDR2>` (e.g. 144)
+- :ref:`NET_IPADDR3<NET_IPADDR3>` (e.g. 14)
 
-- :ref:`NET_NETMASK<NET_NETMASK>` is the number of leading bits set in the subnet mask. For example, if its set to 24, then the subnet mask is  255.255.255.0, which is the default.
-- :ref:`NET_GWADDR0<NET_GWADDR0>`
-- :ref:`NET_GWADDR1<NET_GWADDR1>`
-- :ref:`NET_GWADDR2<NET_GWADDR2>`
-- :ref:`NET_GWADDR3<NET_GWADDR3>`
+These can be dynamically assigned if the network has a DHCP server by enabling ArduPilot's DHCP client using the :ref:`NET_DHCP<NET_DHCP>` parameter, or manually set as desired.
 
-This is the gateway's IP address out of the local sub-net defined by the :ref:`NET_NETMASK<NET_NETMASK>` mask. Any destination IPs that are outside the masked subnet range will be sent to the gateway's MAC address with the final destinations IP address. The default is ``192.168.144.1``.
+Subnet Mask and Gateway
+-----------------------
+
+The subnet mask limits the IP addresses that the autopilot may directly communicate with.
+
+- :ref:`NET_NETMASK<NET_NETMASK>` is the number of leading bits set in the subnet mask. For example, if set to 24 (the default) then the subnet mask is 255.255.255.0.
+
+The gateway IP address is used for routing when communicating with IP addresses out of the local subnet defined by :ref:`NET_NETMASK<NET_NETMASK>`. Any destination IPs that are outside the masked subnet range will be sent to the gateway's MAC address with the final destinations IP address. The default is ``192.168.144.1``.
+
+- :ref:`NET_GWADDR0<NET_GWADDR0>` (e.g. 192)
+- :ref:`NET_GWADDR1<NET_GWADDR1>` (e.g. 168)
+- :ref:`NET_GWADDR2<NET_GWADDR2>` (e.g. 144)
+- :ref:`NET_GWADDR3<NET_GWADDR3>` (e.g. 1)
 
 PPP Configuration
 -----------------