Release notes for voltha-2.9 and adding bandwidth profile documentation

Change-Id: I3bd3857da7aadf577133be5228d611984b129faa
diff --git a/index.rst b/index.rst
index 13674a0..3432470 100644
--- a/index.rst
+++ b/index.rst
@@ -144,7 +144,21 @@
 
    operations/software-upgrade.rst
    ONU software update <voltha-openonu-adapter-go/docs/ONU_Upgrade_Notes.md>
+
+.. toctree::
+   :maxdepth: 1
+   :hidden:
+   :caption: Performance Metrics, Alarms
+
    ONU Performance Metrics <voltha-openonu-adapter-go/docs/PM_Notes.md>
+   ONU Alarms <voltha-openonu-adapter-go/docs/ONU_Alarms.md>
+
+.. toctree::
+   :maxdepth: 1
+   :hidden:
+   :caption: Bandwidth Profiles
+
+   bandwidth-profiles/bandwidth-profiles.rst
 
 .. toctree::
    :maxdepth: 1