Remove unnecessary versions from comments
Summary: D11106 missed version bumping some comments. Instead of maintaining version numbers in the comments this patch removes them.
Test Plan: Inspect comments.
Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien, PiRK
Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien, PiRK
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D11112