iMessage -> iMessageBody

Author: dlepow

articles/api-management/api-management-transformation-policies.md

@@ -346,7 +346,7 @@ In this example the policy routes the request to a service fabric backend, using
 >   -   Preserving the content of a request in the outbound pipeline doesn't make sense because the request has already been sent to the backend at this point.
 >   -   If this policy is used when there is no message body, for example in an inbound GET, an exception is thrown.
 
- For more information, see the `context.Request.Body`, `context.Response.Body`, and the `IMessage` sections in the [Context variable](api-management-policy-expressions.md#ContextVariables) table.
+ For more information, see the `context.Request.Body`, `context.Response.Body`, and the `IMessageBody` sections in the [Context variable](api-management-policy-expressions.md#ContextVariables) table.
 
 [!INCLUDE [api-management-policy-generic-alert](../../includes/api-management-policy-generic-alert.md)]