bobcanthelpyou opened a new pull request #3595: [MINOR] Use KERBEROS_REFRESH_INTERVAL in docs URL: https://github.com/apache/zeppelin/pull/3595 ### What is this PR for? In the PR https://github.com/apache/zeppelin/pull/2443/files the ENV `LAUNCH_KERBEROS_REFRESH_INTERVAL` was renamed to `KERBEROS_REFRESH_INTERVAL` The old ENV name is still used in the shell documentation ### What type of PR is it? [Documentation] ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4553
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