One more fix to doxygen file.

Author: Marwan Mattar

docs/API-Reference.md

@@ -11,8 +11,9 @@ the following command within the `docs/` directory:
 
     doxygen dox-ml-agents.conf
 
-`ml-agents.conf` is a configuration file that includes the classes
-that have been properly formatted. The generated HTML files will be placed
+`dox-ml-agents.conf` is a Doxygen configuration file for ML-Agents
+that includes the classes that have been properly formatted. 
+The generated HTML files will be placed
 in the `html/` subdirectory. Open `index.html` within that subdirectory to 
 navigate to the API reference home. Note that `html/` is already included in 
 the repository's `.gitignore` file.