Review & update workflow authoring page

[marcduiker]

Describe the issue The language samples on the Authoring Workflows page are incomplete / incorrect. For instance the Write the application section for .NET does not show how to schedule a new workflow. And Java shows the Workflow code itself, not the client to start it.

URL of the docs http://localhost:1313/developing-applications/building-blocks/workflow/howto-author-workflow

Expected content Correct language samples for each of the sections on this page.