Fixes #54. Error parsing JSON in firefox

Author: jorgemoralespou

databases-py.adoc

@@ -225,6 +225,9 @@ Items inserted in database: 2740
 If you then go back to `/ws/data/all` you will see tons of JSON data now.
 That's great. Our parks map should finally work!
 
+NOTE: There's some errors reported with browsers like firefox 54 that don't properly parse the resulting JSON. It's
+a browser problem, and the application is working properly.
+
 [NOTE]
 ====
 You are probably wondering how the database connection magically started

databases.adoc

@@ -236,6 +236,9 @@ Items inserted in database: 2740
 If you then go back to `/ws/data/all` you will see tons of JSON data now.
 That's great. Our parks map should finally work!
 
+NOTE: There's some errors reported with browsers like firefox 54 that don't properly parse the resulting JSON. It's
+a browser problem, and the application is working properly. 
+
 [source]
 ----
 http://parksmap-{{EXPLORE_PROJECT_NAME}}{{USER_SUFFIX}}.{{ROUTER_ADDRESS}}