[validation] Fix REJECT message comments
[validation] Fix REJECT message comments

Summary:
Comments change only.

This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/17004 | PR17004]] [4/5]
Commit https://github.com/bitcoin/bitcoin/pull/17004/commits/04a2f326ec0f06fb4fce1c4f93500752f05dede8
Depends on D8183

Test Plan: `ninja`

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8184

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