[CORD-3125] Adding oss blacklist example

Change-Id: I186931aeb8d19d79d0a5b50aa65d0281bce581b1
diff --git a/profiles/rcord/configuration.md b/profiles/rcord/configuration.md
index ca77c7f..a77fc88 100644
--- a/profiles/rcord/configuration.md
+++ b/profiles/rcord/configuration.md
@@ -183,6 +183,7 @@
       properties:
         name: hippie-oss
         kind: oss
+        # blacklist: BRCM1234, BRCM4321 # this is an optional list of ONUs that you don't want to validate
 
     # Create a ServiceDependency between the two
     service_dependency#oss_volt: