Add update client example to API docs

docs/api.rst

@@ -85,6 +85,15 @@ You can also update a client by specifying a value for ‘id’. Next, here’s
 
 If the product_key is set and matches an existing record the product fields will be auto-populated. If the email field is set then we’ll search for a matching client. If no matches are found a new client will be created.
 
+Options
+^^^^^^^
+
+The following options are available when creating an invoice.
+
+- ``email_invoice``: Email the invoice to the client.
+- ``auto_bill``: Attempt to auto-bill the invoice using stored payment methods or credits.
+- ``paid``: Create a payment for the defined amount.
+
 Updating Data
 """""""""""""
 
@@ -96,12 +105,6 @@ Updating Data
     -d '{"name":"test", "contacts":[{"id": 1, "first_name": "test"}]}'
     -H "X-Ninja-Token: TOKEN"
 
-Options
-^^^^^^^
-- ``email_invoice``: Email the invoice to the client.
-- ``auto_bill``: Attempt to auto-bill the invoice using stored payment methods or credits.
-- ``paid``: Create a payment for the defined amount.
-
 Emailing Invoices
 """""""""""""""""