Link to Dropbox from config reference is outdated (#562)

Closes #561

Author: m90

docs/reference/index.md

@@ -368,7 +368,7 @@ The values for each key currently match its default.
 
 # ---
 
-# App key and app secret from your app created at https://www.dropbox.com/developers/apps/info
+# App key and app secret from your app created at https://www.dropbox.com/developers/apps
 
 # DROPBOX_APP_KEY=""
 # DROPBOX_APP_SECRET=""