Update README.md

Author: witold-swierzy

data-platform/autonomous-database/autonomous-json/document_format_conversion_api/README.md

@@ -1,8 +1,8 @@
 This repo contains PL/SQL API for document conversion demonstrating how it is possible to abstract from a particular format (XML or JSON) and work on the data.
 
-*doc directory contains documentation, including overview presentation and user guide
-*sql directory contains API code with scripts allowing easy installation and removal
-*demo directory contains script demonstrating functionality of the API
+**- doc directory contains documentation, including overview presentation and user guide
+**- sql directory contains API code with scripts allowing easy installation and removal
+**- demo directory contains script demonstrating functionality of the API
 
 # License