feat: Kotlin 2.0.20-Beta1 EAP release details (#4299)

* feat: Kotlin 2.0.20-Beta1 EAP release details

* feat: update versions

* feat: update titles

Author: koshachy

docs/kr.tree

@@ -34,7 +34,7 @@
 
     <toc-element toc-title="What's new in Kotlin">
         <toc-element id="whatsnew20.md" toc-title="Kotlin 2.0.0" accepts-web-file-names="whatsnew.html"/>
-        <toc-element id="whatsnew-eap.md" toc-title="Kotlin 2.0.0-RC3" hidden="true"/>
+        <toc-element id="whatsnew-eap.md" toc-title="Kotlin 2.0.20-Beta1"/>
         <toc-element toc-title="Earlier versions">
             <toc-element id="whatsnew1920.md" toc-title="Kotlin 1.9.20"/>
             <toc-element id="whatsnew19.md" toc-title="Kotlin 1.9.0"/>

docs/topics/eap.md

@@ -38,4 +38,21 @@ check [our instructions on how to configure your build to support this version](
 
 ## Build details
 
-_No preview versions are currently available._
+<!-- _No preview versions are currently available._ -->
+
+<table>
+    <tr>
+        <th>Build info</th>
+        <th>Build highlights</th>
+    </tr>
+    <tr>
+        <td><strong>2.0.20-Beta1</strong>
+            <p>Released: <strong>June 18, 2024</strong></p>
+            <p><a href="https://github.com/JetBrains/kotlin/releases/tag/v2.0.20-Beta1" target="_blank">Release on GitHub</a></p>
+        </td>
+        <td>
+            <p>A tooling release for Kotlin 2.0.0</p>
+            <p>For more details, please refer to the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.0.20-Beta1">changelog</a> or <a href="whatsnew-eap.md">What's new in Kotlin 2.0.20-Beta1</a>.</p>
+        </td>
+    </tr>
+</table>