[SDFAB-595] Add UPF configuration guide

Change-Id: I59cb4bd229f70dd334ffb1e3597764374adf4df7
diff --git a/dict.txt b/dict.txt
index d992c3a..b57703f 100644
--- a/dict.txt
+++ b/dict.txt
@@ -4,3 +4,9 @@
 patchset
 reStructuredText
 virtualenv
+UPF
+netcfg
+gRPC
+routable
+downlink
+subnets