[VOL-3961] Software update documentation

Change-Id: I145f685f2db6f55568bd580b81b4f971d5610320
diff --git a/index.rst b/index.rst
index b4bce27..9656fd0 100644
--- a/index.rst
+++ b/index.rst
@@ -79,6 +79,7 @@
    :hidden:
    :caption: Operations
 
+   operations/software-upgrade.rst
    ONU software update <voltha-openonu-adapter-go/ONU_Upgrade_Notes.md>
    ONU Performance Metrics <voltha-openonu-adapter-go/PM_Notes.md>