docs: add empty lines

Author: kenjis

CHANGELOG.md

@@ -4,6 +4,7 @@
 [Full Changelog](https://github.com/codeigniter4/CodeIgniter4/compare/v4.3.0...v4.3.1)
 
 ### Fixed Bugs
+
 * fix: Email config in the .env doesn't appear as expected by @kenjis in https://github.com/codeigniter4/CodeIgniter4/pull/7078
 * fix: TypeError in Validation is_unique/is_not_unique by @kenjis in https://github.com/codeigniter4/CodeIgniter4/pull/7085
 * fix: revert method name resetQuery() changed accidentally by @kenjis in https://github.com/codeigniter4/CodeIgniter4/pull/7083
@@ -12,6 +13,7 @@
 * fix: Call to undefined method Composer\InstalledVersions::getAllRawData() error by @kenjis in https://github.com/codeigniter4/CodeIgniter4/pull/7107
 
 ### Refactoring
+
 * [Rector] Enable AddDefaultValueForUndefinedVariableRector by @samsonasik in https://github.com/codeigniter4/CodeIgniter4/pull/7088
 
 ## [v4.3.0](https://github.com/codeigniter4/CodeIgniter4/tree/v4.3.0) (2023-01-10)