Documented Multiple gnbs support

Change-Id: I0be869eda12bde0a123356fb4640c4995bb5a9d5
diff --git a/dict.txt b/dict.txt
index 4cc0f29..81d8a51 100644
--- a/dict.txt
+++ b/dict.txt
@@ -126,6 +126,7 @@
 gc
 gerrit
 gnb
+gnbs
 gnbsim
 golang
 gpp