added docs for array indexes

Author: dantownsend

docs/src/piccolo/schema/column_types.rst

@@ -215,3 +215,9 @@ Arrays of data can be stored, which can be useful when you want store lots of
 values without using foreign keys.
 
 .. autoclass:: Array
+
+=============================
+Accessing individual elements
+=============================
+
+.. automethod:: Array.__getitem__

piccolo/columns/column_types.py

@@ -1411,7 +1411,9 @@ def __getitem__(self, value: int) -> Array:
 
         .. code-block:: python
 
-            Ticket.select(Ticket.seat_numbers[1]).run_sync
+            >>> Ticket.select(Ticket.seat_numbers[0]).first().run_sync
+            {'seat_numbers': 325}
+
 
         """
         if isinstance(value, int):