Added failfunctions example for slot

docs/slot/index.rst

@@ -21,4 +21,19 @@ More complex example of a slot.
      lore: #Lore for the item
      - "&cThere is dirt in this slot"
      functions: #Functions to run on click
-     - "broadcast: &fThis is a simple test"
+     - "broadcast: &fThis is a simple test"
+	 
+Example using the pay function with a fail function
+
+.. code-block:: yaml
+
+   '0': #Index to be placed at, starting at 0
+     amount: 2 #2 of the item, default is 1
+     icon: "DIRT" #Icon for the slot
+     name: "&cDirt but red" #Name supports color codes
+     lore: #Lore for the item
+     - "&cThere is dirt in this slot"
+     functions: #Functions to run on click
+     - "pay: 1000"
+     pay-failfunctions: #Didn't have 1000 to pay
+     - "pmsg: You do not have enough money"