[docs] [issue11352] Update cgi module doc

[Pierre Quentel]

Pierre Quentel <pierre.quentel at gmail.com> added the comment:

I attach a new version after sharing thought with Glenn

CGI scripts are still unable to define which encoding to use to print the strings received from the user agent. A patch was proposed #11066 but the issue is still pending. The new version documents this issue

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Added file: http://bugs.python.org/file25519/cgi-doc.patch

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