doc: response is not stored after POST request on Invoke with HTTP section example

[agoktugaydin]

Describe the issue

The response is assumed to be stored in the variable named 'result'. However it was not. It causes problem as it is used in the log. Valid for .NET section.

URL of the docs

https://docs.dapr.io/developing-applications/building-blocks/service-invocation/howto-invoke-discover-services/

Expected content

The response should be stored before using it.

[agoktugaydin]

/assignee