chore: update CHANGES-5.0.md

Co-authored-by: Zaiming (Stone) Shi <zmstone@gmail.com>

CHANGES-5.0.md

@@ -8,7 +8,8 @@
 ## Enhancements
 
 * Change the `/gateway` API path to plural form. [#8823](https://github.com/emqx/emqx/pull/8823)
-* Remove `node.etc_dir` from emqx.conf. [#8892](https://github.com/emqx/emqx/pull/8892)
+* Remove `node.etc_dir` from emqx.conf, because it is never used.
+  Also allow user to customize the logging directory [#8892](https://github.com/emqx/emqx/pull/8892)
 
 # 5.0.7