[VOL-4519] Add bbsimctl command to invalidate MDS count of an ONU

Change-Id: I8cdb6c0d5381b952a87e1d24d87cab81de0ddaf9
diff --git a/docs/source/operations.rst b/docs/source/operations.rst
index 3b50fef..d60c369 100644
--- a/docs/source/operations.rst
+++ b/docs/source/operations.rst
@@ -115,6 +115,7 @@
       flows
       get
       igmp
+      invalidate_mds
       list
       poweron
       services