Fix markdown.

Author: ahmetoz

docs/RELEASE_NOTES.md

@@ -33,7 +33,7 @@
 [Javadoc](https://commercetools.github.io/commercetools-sync-java/v/2.2.1/) | 
 [Jar](https://bintray.com/commercetools/maven/commercetools-sync-java/2.2.1)
 
- 🐞 **Bug Fixes** (1)
+- 🐞 **Bug Fixes** (1)
     - **Product Sync** - Fixed a bug in the `ProductSync` related handling of unresolved product references provided in 
     different batches. [#580](https://github.com/commercetools/commercetools-sync-java/issues/580)