Updated Notify_rocketchat (markdown)

Notify_rocketchat.md

@@ -45,6 +45,8 @@ You can also form any combination of the above and perform updates from one url:
 By default a webhook is set up to be associated with a channel.  Thus the following syntax is also valid:
 * **rocket**://**{webhook}**@**{hostname}**/
 
+**Note:** Some webhooks have slashes in them.  For these you need to make sure you escape the slash (`/`) with `%2F`.  So your URL may look like:
+* `rocket://abcd%2F12345@{hostname}/` - Note the `%2F` (to swap out for `/` found in webhook)
 
 ### Parameter Breakdown
 | Variable    | Required | Description