Add `ONOS` to dictionary and fix usage in text blocks

Change-Id: I9eabdacfcff34c8e730c0148e1e6ce078cff796a
diff --git a/dict.txt b/dict.txt
index 8d2eddd..1f90758 100644
--- a/dict.txt
+++ b/dict.txt
@@ -21,6 +21,7 @@
 NxM
 ONF
 ONIE
+ONOS
 OpenConfig
 PFCP
 Pre