[docs] [issue29920] Document cgitb.text and cgitb.html

[Berker Peksag]

Berker Peksag added the comment:

Please don't close it yet. I agree with Serhiy's comments in msg293394, but I couldn't find time to address his comments yet (plus we still need to backport the documentation update to 3.5 and 3.6 branches)

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