[docs] [issue12706] timeout sentinel in ftplib and poplib documentation

[Greg]

Greg added the comment:

In the definition of FTP.connect(), I've changed the code to actually use None as a lack-of-explicit-timeout sentinel instead of -999. For FTP and FTP_TLS, I've changed the documentation to reflect what the code is doing.

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keywords: +patch
nosy: +εσχατοκυριος
Added file: http://bugs.python.org/file35524/patch.patch

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