Replace ONL with SONiC

Change-Id: I8b52a79401fbf70aaceac25549048a73fb22dae6
diff --git a/specification.rst b/specification.rst
index c8fa016..4cb59ba 100644
--- a/specification.rst
+++ b/specification.rst
@@ -248,7 +248,7 @@
 
 White Box Switch Software
 -------------------------
-- Open source ONL, ONIE, Docker, Kubernetes
+- Open source SONiC, ONIE, Docker, Kubernetes
 - Stratum available from ONF
 
 .. rubric:: Footnotes