Fix formatting of env. vars. in site/kube-addon.md.

site/kube-addon.md

@@ -161,20 +161,20 @@ inserted into the YAML file like this:
 
 The list of variables you can set is:
 
-* CHECKPOINT\_DISABLE - if set to 1, disable checking for new Weave Net
+* `CHECKPOINT_DISABLE` - if set to 1, disable checking for new Weave Net
   versions (default is blank, i.e. check is enabled)
-* IPALLOC\_RANGE - the range of IP addresses used by Weave Net
-  and the subnet they are placed in (CIDR format; default 10.32.0.0/12)
-* EXPECT\_NPC - set to 0 to disable Network Policy Controller (default is on)
-* KUBE\_PEERS - list of addresses of peers in the Kubernetes cluster
+* `IPALLOC_RANGE` - the range of IP addresses used by Weave Net
+  and the subnet they are placed in (CIDR format; default `10.32.0.0/12`)
+* `EXPECT_NPC` - set to 0 to disable Network Policy Controller (default is on)
+* `KUBE_PEERS` - list of addresses of peers in the Kubernetes cluster
   (default is to fetch the list from the api-server)
-* IPALLOC\_INIT - set the initialization mode of the [IP Address
+* `IPALLOC_INIT` - set the initialization mode of the [IP Address
   Manager](/site/operational-guide/concepts.md#ip-address-manager)
-  (defaults to consensus amongst the KUBE\_PEERS)
-* WEAVE\_EXPOSE\_IP - set the IP address used as a gateway from the
+  (defaults to consensus amongst the `KUBE_PEERS`)
+* `WEAVE_EXPOSE_IP` - set the IP address used as a gateway from the
   Weave network to the host network - this is useful if you are
   configuring the addon as a static pod.
-* WEAVE\_MTU - Weave Net defaults to 1376 bytes, but you can set a
+* `WEAVE_MTU` - Weave Net defaults to 1376 bytes, but you can set a
   smaller size if your underlying network has a tighter limit, or set
   a larger size for better performance if your network supports jumbo
   frames - see [here](/site/using-weave/fastdp.md#mtu) for more