tuteng opened a new pull request #5738: Support auto generate pulsar admin cli URL: https://github.com/apache/pulsar/pull/5738 ### Motivation Currently, the commands on the page http://pulsar.apache.org/docs/en/pulsar-admin/ are all manually added. when the document changes, there are often wrong contents. in order to solve this problem, we expect the commands on this page to be automatically generated. this pr is the first step. If it passes, we will add a new page on the website to show the automatically generated commands later. ### Modifications * Add a hidden command `--generate-doc` to automatically generate command line documents * Add integration tests ### Usage ``` ./bin/pulsar-admin --generate-doc tenants ./bin/pulsar-admin --generate-doc namespaces ..... ``` The following is what we expect:  ### Verifying this change Integration test pass
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