Update plugin.json

Author: DanielHindi

plugin.json

@@ -3,7 +3,7 @@
   ,"pluginName":"PDFViewer plugin"
   ,"pluginDescription":"The PDF Viewer plugin allows you to link to external PDF files.Related Topics:Scan,Photo"
   ,"supportEmail":"support@buildfire.com"
-  ,"supportSite":"http://support.appdocumentation.com/knowledge-base/pdf-viewer-plugin-tutorial/"
+  ,"supportSite":"http://learn.appdocumentation.com/plugin-tutorials/pdf-viewer-plugin-tutorial"
   ,"pluginIcon":"icon.png"
   ,"licenseKey": "a4sd6-as654asd6as545a65s4d6a-65asd564a"
   ,"control":{