[VOL-5020] Release patch repo:voltha-helm-charts

howto/release/charts/index.rst
howto/release/charts/voltha-openolt-adapter.rst
-----------------------------------------------
  o Documenty howto update helm charts for repo:voltha-openolt-adapter

Change-Id: I37313bbc199aca4b258f53b1622efdf4f06c1087
diff --git a/howto/release/index.rst b/howto/release/index.rst
index a276db6..507ec11 100644
--- a/howto/release/index.rst
+++ b/howto/release/index.rst
@@ -28,4 +28,5 @@
    repositories/index
    scripts/preparation
    scripts/repository-voltha-release
+   voltha-helm-charts
    voltha-system-tests/index