Add note about changelog generation to README (#639) (#689)

* Add note about changelog generation to README

* make it prettier

dev/release/README.md

@@ -67,6 +67,16 @@ The CHANGELOG is created automatically using
 This script creates a changelog using github issues and the
 labels associated with them.
 
+## CHANGELOG for maintenance releases
+
+At the time of writing, the `update_change_log.sh` script does not work well with branches as it seems to intermix issues that were resolved in master.
+
+To generate a bare bones CHANGELOG for maintenance releases, you can use a command similar to the following to get all changes between 5.0.0 and the active_release.
+
+```shell
+git log --pretty=oneline 5.0.0..apache/active_release
+```
+
 # Mechanics of creating a release
 
 ## Prepare the release branch and tags

dev/release/create-tarball.sh

@@ -86,7 +86,8 @@ The proposed release tarball and signatures are hosted at [2].
 The changelog is located at [3].
 
 Please download, verify checksums and signatures, run the unit tests,
-and vote on the release.
+and vote on the release. There is a script [4] that automates some of
+the verification.
 
 The vote will be open for at least 72 hours.
 
@@ -97,6 +98,7 @@ The vote will be open for at least 72 hours.
 [1]: https://github.com/apache/arrow-rs/tree/${release_hash}
 [2]: ${url}
 [3]: https://github.com/apache/arrow-rs/blob/${release_hash}/CHANGELOG.md
+[4]: https://github.com/apache/arrow-rs/blob/master/dev/release/verify-release-candidate.sh
 MAIL
 echo "---------------------------------------------------------"