[issue3874] documentation bug: HTMLParser needs to document unknown_decl

[Terry J. Reedy]

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

OK, your recommendation is to add one entry with the text suggested in the message. Given the name, the text seems reasonable. I will leave it to a doc person to format and apply.

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keywords: +patch
stage:  -> needs patch

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<http://bugs.python.org/issue3874>
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