update links in reactivity basics page

Author: LadyBluenotes

src/routes/reactivity/basics.mdx

@@ -87,6 +87,7 @@ You can learn more about [component lifecycles in the Intro to Components page](
 
 
 ## Related pages
-- [Signals](/reactivity/signals)
-- [Effects](/reactivity/effects)
-- [Introduction to Components](/components/intro)
+
+- [Signals](/reactivity/signals) - Understanding and using signals.
+- [Effects](/reactivity/effects) - Managing side effects in your app.
+- [Introduction to Components](/components/intro) - Building reusable UI components.