BUG #14773: Incorrect documentation for the Relation logical replication message format

The following bug has been logged on the website:

Bug reference: 14773
Logged by: Kyle Conroy
Email address: kyle@kyleconroy.com
PostgreSQL version: 10beta2
Operating system: macOS
Description:

I'm working on a Golang parser[0]https://github.com/kyleconroy/pgoutput for logical replication. I was trying to
parse a Relation message, but noticed additional bytes at the end of the
message.

It appears the documentation[1]https://www.postgresql.org/docs/devel/static/protocol-logicalrep-message-formats.html is missing two fields: attribute type and
attribute mode[2]https://github.com/postgres/postgres/blob/113b0045e20d40f726a0a30e33214455e4f1385e/src/backend/replication/logical/proto.c#L553.

Thanks!

[0]: https://github.com/kyleconroy/pgoutput
[1]: https://www.postgresql.org/docs/devel/static/protocol-logicalrep-message-formats.html
https://www.postgresql.org/docs/devel/static/protocol-logicalrep-message-formats.html
[2]: https://github.com/postgres/postgres/blob/113b0045e20d40f726a0a30e33214455e4f1385e/src/backend/replication/logical/proto.c#L553
https://github.com/postgres/postgres/blob/113b0045e20d40f726a0a30e33214455e4f1385e/src/backend/replication/logical/proto.c#L553

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