docs: update api index

Author: xchopin

docs/api/index.md

@@ -2,6 +2,12 @@
 
 Documentation of API endpoints.
 
-* [Routes](routes.md)
 * [About Caliper endpoints](caliper.md)
-* [API usage examples](examples.md)
+* [API usage examples](examples.md)
+
+<br>
+
+**Routes**
+
+*All the informations about the routes are available on Swagger UI by using this following link:* 
+`http://SERVER_URI:PORT/swagger-ui.html (eg: http://localhost:9966/swagger-ui.html)`