Voltha 2.6 release notes - minor updates
Update doc version to 2.6.2

Change-Id: Ib358a9d04cdb1bca9c81f06913488fa718c25963
diff --git a/VERSION b/VERSION
index 6a6a3d8..097a15a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.6.1
+2.6.2