[issue29920] Document cgitb.text and cgitb.html

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The main functions of the cgitb module are enable() and handler(). I would describe them first, and text() and html() at the end (maybe in separate subsection). Actually the main part of the descriptions of text() and html() can be shared and placed in a paragraph preceding them: "The following two functions handle..."

Note that the documented name of the first parameter is "info", but actual name is "einfo".

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nosy: +martin.panter, serhiy.storchaka

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