[issue23952] cgi: Document the 'maxlen' member of the cgi module

[Ethan Furman]

Change by Ethan Furman <ethan at stoneleaf.us>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23952>
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