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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Unlike the 3.9 code and doc change in #39411, this doc change applies since 3.7.  It does not conflict with #39411.

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versions: +Python 3.7, Python 3.8

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