[docs] [issue21430] Document ssl.pending()

[Antoine Pitrou]

Antoine Pitrou added the comment:

pending() shouldn't be necessary for this. See https://docs.python.org/dev/library/ssl.html#notes-on-non-blocking-sockets

Generally, when using non-blocking sockets, you first try to read (or write) and then catch any exceptions that might be raised if the socket isn't ready.

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