doc: add reference to wire protocol details

Bruce Momjian <bruce@momjian.us>

Commit: 783e816666c7e70bc79c10aa14dd3d56c61dd483
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-11-01T17:57:29Z
Releases: 17.0
doc:  add reference to wire protocol details

Discussion: https://postgr.es/m/143A51B2-80B1-4ECD-AF67-F7061377FF63@hotmail.com

Author: Li Japin

Backpatch-through: master

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doc/src/sgml/protocol.sgml modified +4 −2

Documentation touched