changelog: use single format

After discussion with Ecosystem team, we decided not to specify PR in
CHANGELOG entries if there is a related issue. This patch make last
CHANGELOG entries consistent.

CHANGELOG.md

@@ -8,7 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 
 ### Added
-* `crud.storage_info` function to get storages status (#229, PR #299).
+* `crud.storage_info` function to get storages status (#229).
 * Support `vshard_router` option in operations for Cartridge vshard groups
   or non-default vshard routers (#44).
 
@@ -21,9 +21,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 * Fetching invalid ddl configuration (sharding key for non-existing space)
-  is no longer breaks CRUD requests (#308, PR #309).
-* ddl space record delete no more throws error if crud is used (#310, PR #311).
-* crud sharding metainfo is now updated on ddl record delete (#310, PR #311).
+  is no longer breaks CRUD requests (#308).
+* ddl space record delete no more throws error if crud is used (#310).
+* crud sharding metainfo is now updated on ddl record delete (#310).
 
 ## [0.12.0] - 28-06-22
 
@@ -32,7 +32,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   `crud.insert_many()`/`crud.insert_object_many()`/
   `crud.upsert_many()`/`crud.upsert_object_many()`
   `crud.replace_many()`/`crud.replace_object_many()`
-  with partial consistency (#193, PR #232).
+  with partial consistency (#193).
 
 ## [0.11.3] - 15-06-22