EDU-3748: Tweak signal vs update text (#3277)

* Tweak signal vs update text

* Tweak

---------

Co-authored-by: Erica Sadun <[email protected]>

Author: dandavison

docs/encyclopedia/application-message-passing.mdx

@@ -51,7 +51,7 @@ Unlike Signals, Updates must be synchronous. That is, they must wait for the Wor
 Use Signals instead of Updates when:
 
 - The Workflow's clients want to quickly move on after sending an asynchronous message.
-- The clients care more about the latency of sending the message than they do about the latency of the end-to-end operation.
+- The clients are willing to "fire and forget": they don't want a result or exception from the message.
 - The clients don't want to rely on the Worker being available.
 
 Use Updates instead of Signals when: