Changelog: cleanup (cortexproject#4584)

Rearrange `CHANGELOG.md` to conform to instructions in
`pull_request_template.md`.

Also add a `-` to a CLI flag to conform to instructions in
`design-patterns-and-conventions.md`.

Signed-off-by: Andrew Seigner <andrew@sig.gy>
Signed-off-by: Alvin Lin <alvinlin@amazon.com>

Author: siggy

CHANGELOG.md

@@ -10,10 +10,10 @@
 =======
 
 * [CHANGE] Changed default for `-ingester.min-ready-duration` from 1 minute to 15 seconds. #4539
-* [ENHANCEMENT] Ruler: Add `ruler.disable-rule-group-label` to disable the `rule_group` label on exported metrics. #4571
+* [CHANGE] query-frontend: Do not print anything in the logs of `query-frontend` if a in-progress query has been canceled (context canceled). #4562
+* [ENHANCEMENT] Ruler: Add `-ruler.disable-rule-group-label` to disable the `rule_group` label on exported metrics. #4571
 * [ENHANCEMENT] Query federation: improve performance in MergeQueryable by memoizing labels. #4502
 * [ENHANCEMENT] Added new ring related config `-ingester.readiness-check-ring-health` when enabled the readiness probe will succeed only after all instances are ACTIVE and healthy in the ring, this is enabled by default. #4539
-* [CHANGE] query-frontend: Do not print anything in the logs of `query-frontend` if a in-progress query has been canceled (context canceled). #4562
 * [ENHANCEMENT] Added new ring related config `-distributor.excluded-zones` when set this will exclude the comma-separated zones from the ring, default is "". #4539
 * [ENHANCEMENT] Upgraded Docker base images to `alpine:3.14`. #4514
 * [ENHANCEMENT] Updated Prometheus to latest. Includes changes from prometheus#9239, adding 15 new functions. Multiple TSDB bugfixes prometheus#9438 & prometheus#9381. #4524