doc: Clarify support for `allowHalfOpen` option for IPC connections

[jbriales]

📗 API Reference Docs Problem

• Version: v15.11.0

• Platform: Linux ... 5.11.10-100.fc32.x86_64 deps: update openssl to 1.0.1j #1 SMP Thu Mar 25 14:26:30 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

• Subsystem: net

Location

Section of the site where the content exists

Affected URL(s):

• https://nodejs.org/api/net.html#net_net_createserver_options_connectionlistener
• https://nodejs.org/api/net.html#net_new_net_socket_options

Description

Concise explanation of the problem

The documentation on allowHalfOpen states:

Indicates whether half-opened TCP connections are allowed.

It explicitly mentions TCP, but I tried on an IPC connection with Unix Domain Socket and the option also seems to work as expected.
Should the doc be updated to either drop the explicit TCP mention or clarify expectations wrt IPC connections?