[docs] [issue33921] Explain that '' can be used to bind to all interfaces for the AF_INET address family in the docs

Ammar Askar report at bugs.python.org
Thu Jun 21 07:01:12 EDT 2018

Ammar Askar <ammar at ammaraskar.com> added the comment:

It's kinda mentioned:

"For IPv4 addresses, two special forms are accepted instead of a host address: the empty string represents INADDR_ANY"

Though it could be more explicit on what means since binding to all interfaces is a common use case.

nosy: +ammar2

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