review comments

Signed-off-by: Krasi Georgiev <[email protected]>

CHANGELOG.md

@@ -15,7 +15,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 
 ### Fixed
 
-- [#3010](https://github.com/thanos-io/thanos/pull/3010) Querier: Data gaps when switching iterators.
+- [#3010](https://github.com/thanos-io/thanos/pull/3010) Querier: Prevent data gaps while switching replicas.
 - [#2937](https://github.com/thanos-io/thanos/pull/2937) Receive: Fixing auto-configuration of --receive.local-endpoint
 - [#2665](https://github.com/thanos-io/thanos/pull/2665) Swift: fix issue with missing Content-Type HTTP headers.
 - [#2800](https://github.com/thanos-io/thanos/pull/2800) Query: Fix handling of `--web.external-prefix` and `--web.route-prefix`