interface: add the transmit queue infrastructure document

Type: docs

Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: I57f27f8ec4be7f3d8dc3d13ff4ea6b1b21c3cf6b
diff --git a/docs/developer/corefeatures/index.rst b/docs/developer/corefeatures/index.rst
index 79722de..780fc83 100644
--- a/docs/developer/corefeatures/index.rst
+++ b/docs/developer/corefeatures/index.rst
@@ -17,6 +17,7 @@
     span_doc
     mtu
     gso
+    tx_queue
     sylog_doc
     eventviewer
     stats