[docs] Fix changelog formatting

Author: nhairs

docs/changelog.md

@@ -15,18 +15,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Rename `pythonjsonlogger.core.LogRecord` and `log_record` arguments to avoid confusion / overlapping with `logging.LogRecord`. [#38](https://github.com/nhairs/python-json-logger/issues/38)
-    - Affects arguments to `pythonjsonlogger.core.BaseJsonFormatter` (and any child classes).
-        - `serialize_log_record`
-        - `add_fields`
-        - `jsonify_log_record`
-        - `process_log_record`
-    - Note: functions referring to `log_record` have **not** had their function name changed.
+  - Affects arguments to `pythonjsonlogger.core.BaseJsonFormatter` (and any child classes).
+    - `serialize_log_record`
+    - `add_fields`
+    - `jsonify_log_record`
+    - `process_log_record`
+  - Note: functions referring to `log_record` have **not** had their function name changed.
 
 ### Removed
 - Remove support for providing strings instead of objects when instantiating formatters. Instead use the `DictConfigurator` `ext://` prefix format when using `fileConfig`/`dictConfig`. [#47](https://github.com/nhairs/python-json-logger/issues/47)
-    - Affects `pythonjsonlogger.json.JsonFormatter`: `json_default`, `json_encoder`, `json_serializer`.
-    - Affects `pythonjsonlogger.orjson.OrjsonFormatter`: `json_default`.
-    - Affects `pythonjsonlogger.msgspec.MsgspecFormatter`: `json_default`.
+  - Affects `pythonjsonlogger.json.JsonFormatter`: `json_default`, `json_encoder`, `json_serializer`.
+  - Affects `pythonjsonlogger.orjson.OrjsonFormatter`: `json_default`.
+  - Affects `pythonjsonlogger.msgspec.MsgspecFormatter`: `json_default`.
 
 Thanks @rubensa