Looking for Client/Server Protocol Documentation

[Kieron Woodhouse]

I'm looking for documentation on the structure of a 'Field Packet', which ought to describe the attributes of fields in a resultset. However, I'm having difficulty finding the relevant docs.

I'm looking at the source code for a MySQL driver for Golang, which includes a link to documentation that used to live at the following URL:
http://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnDefinition41

That link gets redirected to here:
https://dev.mysql.com/doc/internals/en/client-server-protocol.html

And the page redirected to mentions the docs that used to exist in that chapter of the MySQL internals manual have moved into the doxygen docs, and can apparently be found here:
http://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_PROTOCOL.html

Having poked around the Client/Server Protocol section in doxygen, I still can't find the documentation on field packet structure that I'm looking for. I'm particularly concerned that the Command Phase page linked below is blank.
https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_command_phase.html

Can anyone help me find what I'm looking for?
Is there an archive for outdated documentation?
Are the doxygen docs erroneously missing the page(s) I'm looking for?

Thanks in advance,

Kieron