Update Helm 3 doc to improve usability (#27598)
Update Helm 3 doc to improve usability (#27598)

* Update Helm 3 doc to improve usability

Signed-off-by: Martin Hickey <5a111d7c144d6e07073f7da1705506e1d8bdbf43@ie.ibm.com>

* Update after reviews

Review comments:
- https://github.com/istio/istio/pull/27598#pullrequestreview-497853977
- https://github.com/istio/istio/pull/27598#pullrequestreview-498224470

Signed-off-by: Martin Hickey <5a111d7c144d6e07073f7da1705506e1d8bdbf43@ie.ibm.com>
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