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

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

Change-Id: I37313bbc199aca4b258f53b1622efdf4f06c1087
6 files changed