Extending txqueuelen param for linux.network

Prod-Related: PROD-35773
Change-Id: I25ac53dfb6080608ee21d8595d59a5fde1dcca9b
diff --git a/README.rst b/README.rst
index 7e580f3..4994fa7 100644
--- a/README.rst
+++ b/README.rst
@@ -2173,7 +2173,15 @@
 
     linux:
       network:
-        tap_custom_txqueuelen: 10000
+        custom_txqueuelen
+          tap:
+            queue_length: 10000
+            enabled: true
+            device_filter: 'tap[0-9a-z\-]*'
+          ten:
+            enabled: false
+          veth:
+            queue_length: 20000
 
 Auto repair/re-attach libvirt's vnet interfaces: