Update slides for Asynchronous Development

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This merge request fixes the slides for FILS Lecture 04 - Asynchronous Development.

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This merge request was tested by @alexandru.radovici.

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Signed-off-by: Alexandru Radovici alexandru.radovici@wyliodrin.com

slides/lectures/resources/communication/slides.md

@@ -129,7 +129,7 @@ sends data from one task to another
 
 [`Channel`](https://docs.embassy.dev/embassy-sync/git/default/channel/struct.Channel.html) - A Multiple Producer Multiple Consumer (MPMC) channel. Each message is only received by a single consumer.
 
-[`Signal`](https://docs.embassy.dev/embassy-sync/git/default/pubsub/struct.PubSubChannel.html) - Signalling latest value to a single consumer. 
+[`Signal`](https://docs.embassy.dev/embassy-sync/git/default/signal/struct.Signal.html) - Signalling latest value to a single consumer. 
 
 ```mermaid
 flowchart LR
@@ -166,7+166,7 @@
 # PubSubChannel
 sends data from one task to all receiver tasks
 
 [`PubSubChannel`](https://docs.embassy.dev/embassy-sync/git/default/signal/struct.Signal.html) - A broadcast channel (publish-subscribe) channel. Each message is received by all consumers.
 
 ```mermaid
 flowchart LR