Update README.rst

README.rst

@@ -49,7 +49,7 @@ Simple data items
   Data items are included in the request body. Depending on the ``Content-Type``, they are automatically serialized as a JSON ``Object`` (default) or ``application/x-www-form-urlencoded`` (the ``-f`` flag). Data items use ``=`` as the separator, e.g., ``hello=world``.
 
 Raw JSON items
-  This item type is needed when ``Content-Type`` is JSON and a field's value is a ``Boolean``, ``Number``,  nested ``Object`` or an ``Array``, because simple data items are always serialized as ``String``. E.g. ``pies=[1,2,3]``.
+  This item type is needed when ``Content-Type`` is JSON and a field's value is a ``Boolean``, ``Number``,  nested ``Object`` or an ``Array``, because simple data items are always serialized as ``String``. E.g. ``pies:=[1,2,3]``.
 
 Examples
 ^^^^^^^^