Update plugin.json

Author: DanielHindi

plugin.json

@@ -3,7 +3,7 @@
   "pluginName": "JotForm",
   "pluginDescription": "JotForm Plugin allows you to link to external forms, web pages and documents simply by entering the page's URL.",
   "supportEmail": "support@buildfire.com",
-  "supportSite":"http://support.appdocumentation.com/knowledge-base/jotform-plugin-tutorial/",
+  "supportSite":"http://learn.appdocumentation.com/plugin-tutorials/jotform-plugin-tutorial/",
   "control": {
     "content": {
       "enabled": true