[issue39654] pyclbr: remove old references to class browser & add explain readmodule

[Hakan]

Change by Hakan <hakancelik96 at outlook.com>:


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keywords: +patch
pull_requests: +17904
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18528

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39654>
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