Update QoS documentation

Change-Id: I2d928e8f9a1fd824a8781e6506ccb0276bb91833
diff --git a/dict.txt b/dict.txt
index 191c12e..f583217 100644
--- a/dict.txt
+++ b/dict.txt
@@ -135,6 +135,7 @@
 unconfigured
 unicast
 untagged
+upf
 uplink
 vRouter
 verifiability