Fix links

packages/lit-dev-content/site/blog/2024-10-02-signals.md

@@ -11,12 +11,12 @@ author:
 # Announcing @lit-labs/signals: Integrating the TC39 Signals Proposal with Lit
 
 We’re thrilled to announce the release of our newest Lit Labs package,
-`@lit-labs/signals`, which integrates the exciting new [TC39 Signals
-Proposal](https://github.com/tc39/proposal-signals)
-[polyfill(https://github.com/proposal-signals/signal-polyfill)] directly with
-Lit. This package provides a powerful, reactive way to manage state in your web
-applications by allowing you to use shared, observable signals that
-automatically update components when their values change.
+`@lit-labs/signals`, which integrates the
+[polyfill](https://github.com/proposal-signals/signal-polyfill) for the
+exciting new [TC39 Signals Proposal](https://github.com/tc39/proposal-signals)
+directly with Lit. This package provides a powerful, reactive way to manage
+state in your web applications by allowing you to use shared, observable
+signals that automatically update components when their values change.
 
 Signals are quickly becoming a core feature in the JavaScript ecosystem, with
 the potential to unify how we manage state and reactivity across various