gh-100231: Clarify AF_PACKET protocol byte order

[nightcityblade]

Clarify that AF_PACKET protocol numbers passed to socket.socket() must
be converted to network byte order, and show ETH_P_ALL with
socket.htons().

Fixes #100231.

• Issue: socket.AF_PACKET doc: proto is *not* in network byte order #100231

[read-the-docs-community]

Documentation build overview

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± library/socket.html