git_changelog: use modern format for rel branch names in example

bmomjian · bmomjian · commit 395a9a124877 · 2020-04-24T15:16:07.000-04:00
e.g., REL_12_STABLE
diff --git a/src/tools/git_changelog b/src/tools/git_changelog
@@ -34,7 +34,7 @@
 # To generate major release notes, use:
 #   git_changelog --master-only --brief --oldest-first --since='start-date'
 # To find the appropriate start date, use:
-#   git show --summary $(git merge-base REL9_5_STABLE master)
+#   git show --summary $(git merge-base REL_12_STABLE master)
 # where the branch to mention is the previously forked-off branch.  This
 # shows the last commit before that branch was made.
 #

Original file line number	Diff line number	Diff line change
`@@ -34,7 +34,7 @@`
`34`	`34`	`# To generate major release notes, use:`
`35`	`35`	`# git_changelog --master-only --brief --oldest-first --since='start-date'`
`36`	`36`	`# To find the appropriate start date, use:`
`37`		`-# git show --summary $(git merge-base REL9_5_STABLE master)`
	`37`	`+# git show --summary $(git merge-base REL_12_STABLE master)`
`38`	`38`	`# where the branch to mention is the previously forked-off branch. This`
`39`	`39`	`# shows the last commit before that branch was made.`
`40`	`40`	`#`