Update changelog structure

Author: phansys

CHANGELOG.md

@@ -11,7 +11,7 @@ a release.
 
 ```
 ## [3.6.1] - 2022-07-26
-#### Fixed
+### Fixed
 - Sortable: Fix issue with add+delete position synchronization (#1932)
 ```
 
@@ -20,30 +20,30 @@ a release.
 ## [Unreleased]
 
 ## [3.8.0] - 2022-07-17
-#### Added
+### Added
 - Sluggable: Add support for `DateTimeImmutable` fields
 - Tree: [NestedSet] `childrenQueryBuilder()` to allow specifying sort order separately for each field
 - Tree: [NestedSet] Added option to reorder only direct children in `reorder()` method
 
-## Changed
+### Changed
 - Tree: In `ClosureTreeRepository::removeFromTree()` and `NestedTreeRepository::removeFromTree()` when something fails in the transaction, it uses the `code` from the original exception to construct the `\Gedmo\Exception\RuntimeException` instance instead of `null`.
 
-#### Fixed
+### Fixed
 - Sluggable: Cast slug to string before passing it as argument 2 to `preg_match()` (#2473)
 - Sortable: [SortableGroup] Fix sorting date columns in SQLite (#2462).
 - PHPDoc of `AbstractMaterializedPath::removeNode()` and `AbstractMaterializedPath::getChildren()`
 - Retrieving the proper metadata cache from Doctrine when using a CacheWarmer.
 
 ## [3.7.0] - 2022-05-17
-## Added
+### Added
 - Add support for doctrine/persistence 3
 
-## Changed
+### Changed
 - Removed call to deprecated `ClassMetadataFactory::getCacheDriver()` method.
 - Dropped support for doctrine/mongodb-odm < 2.3.
 - Make doctrine/cache an optional dependency.
 
-## Fixed
+### Fixed
 - Loggable: Fix `appendNumber` renaming for files without extension (#2228)
 
 ## [3.6.0] - 2022-03-19

CONTRIBUTING.md

@@ -26,9 +26,8 @@ If there is a related GitHub issue, add it as a suffix to your change.
 
 ```
 ## [Unreleased]
-### Loggable
-#### Fixed
-- Allow emoji in the docs (#123)
+### Fixed
+- Loggable: Allow emoji in the docs (#123)
 ```
 
 ## What You Can Contribute