Merge pull request #501 from OpenGeoscience/update-tiles-example-description

Update the Tile examples description and thumbnail.

Author: manthey

examples/tiles/example.json

@@ -1,9 +1,9 @@
 {
   "path": "tiles",
-  "title": "Tile layer with query options",
+  "title": "Tile layer with controllable options",
   "exampleCss": ["main.css"],
   "exampleJs": ["main.js"],
   "about": {
-    "text": "Basic rendering tiles from a map or image tile server, with many options adjustable via url query parameters."
+    "text": "This example provides controls for changing many options on tile layers.  The code and query parameters allow even more options to be adjusted."
   }
 }