Fix changelog entry for #5203 and add missing blank line.

CHANGELOG.md

@@ -5,7 +5,7 @@
 ### Grafana Mimir
 
 * [CHANGE] Store-gateway: skip verifying index header integrity upon loading. To enable verification set `blocks_storage.bucket_store.index_header.verify_on_load: true`.
-* [CHANGE] Querier: change the default value of the experimental `-querier.streaming-chunks-per-ingester-buffer-size` flag to 128. #5203
+* [CHANGE] Querier: change the default value of the experimental `-querier.streaming-chunks-per-ingester-buffer-size` flag to 256. #5203
 * [ENHANCEMENT] Cardinality API: When zone aware replication is enabled, the label values cardinality API can now tolerate single zone failure #5178
 * [ENHANCEMENT] Distributor: optimize sending requests to ingesters when incoming requests don't need to be modified. For now this feature can be disabled by setting `-timeseries-unmarshal-caching-optimization-enabled=false`. #5137
 * [ENHANCEMENT] Add advanced CLI flags to control gRPC client behaviour: #5161
@@ -21,6 +21,7 @@
 * [BUGFIX] Ingester: Handle when previous ring state is leaving and the number of tokens has changed. #5204
 
 ### Mixin
+
 * [CHANGE] Dashboards: show all workloads in selected namespace on "rollout progress" dashboard. #5113
 * [CHANGE] Dashboards: show the number of updated and ready pods for each workload in the "rollout progress" panel on the "rollout progress" dashboard. #5113
 * [ENHANCEMENT] Dashboards: adjust layout of "rollout progress" dashboard panels so that the "rollout progress" panel doesn't require scrolling. #5113