Fix broken URL

Author: seth-mg

examples/categories.curl

@@ -3,5 +3,5 @@ curl -s -X POST \
     -H "Content-Type: application/json" \
     -H "Accept: application/json" \
     -H "Cache-Control: no-cache" \
-    -d '{"contentUri": "https://onlocationvacations.com/2018/02/06/downton-abbey-exhibition-extended-april-2-nyc/" }' \
+    -d '{"contentUri": "https://www.rosette.com/about/" }' \
     "https://api.rosette.com/rest/v1/categories"