[DX] Documentation example and TS Docs for the returned operation result of client-side API should be enhanced

[taefi]

When calling an method on signal instances in the TS code, an Operation object is returned containing a result promise, through which the user can subscribe for success or failure, as well as handling the errors. It seems that the followings can be enhances:

• The TS Docs for Operation to include a short example (missing further description/example)
• A section in the docs that briefly demonstrates how to leverage from this returned promise. (missing)