docs: only mention resources

Author: ignace

app/templates/editions/polaris.hbs

@@ -24,7 +24,7 @@
   <p>Embroider is the next-generation build system for Ember apps. The goal is to compile Ember apps into spec-compliant, modern Javascript. This allows the integration with all the build tooling improvements seen in the wider JavaScript ecosystem.</p>
 
   <h3>4. Reactivity improvements</h3>
-  <p>The Octane edition saw the introduction of auto-tracking which simplified the previous reactivity system, and made it more performant. Polaris builds on top of these improvements with <a href="https://github.com/tracked-tools/tracked-built-ins">extensions for non-primitive values</a>. Polaris also introduces the concept of <a href="https://github.com/NullVoxPopuli/ember-resources">resources</a> to encapsulate reactive values and co-locate resources with their cleanup logic.</p>
+  <p>The Octane edition saw the introduction of auto-tracking which simplified the previous reactivity system, and made it more performant. Polaris introduces the concept of <a href="https://github.com/NullVoxPopuli/ember-resources">resources</a>. This pattern is a general concept that extends beyond Ember or any framework, and this is what <a href="https://www.starbeamjs.com/">Starbeam</a> is solving: Universal Reactivity.</p>
 
   <h2>How you can help</h2>
   <p>