git_changelog: use modern format for rel branch names in example

Bruce Momjian <bruce@momjian.us>

Commit: 395a9a124877d3c41328fcfebcf0c68df86d9bfd
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-04-24T19:16:07Z
Releases: 13.0
git_changelog: use modern format for rel branch names in example

e.g., REL_12_STABLE

Files

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src/tools/git_changelog modified +1 −1