update: Kotlin 2.2.21-RC2 eap release details (#5107)

This PR adds information for the 2.2.21-RC2 release details

Author: daniCsorbaJB

docs/topics/eap.md

@@ -62,13 +62,13 @@ In this channel, you can also get notifications about new EAP builds.
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-        <td><strong>2.2.21-RC</strong>
-            <p>Released: <strong>October 7, 2025</strong></p>
-            <p><a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.21-RC" target="_blank">Release on GitHub</a></p>
+        <td><strong>2.2.21-RC2</strong>
+            <p>Released: <strong>October 16, 2025</strong></p>
+            <p><a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.21-RC2" target="_blank">Release on GitHub</a></p>
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             <p>A tooling release containing support for Xcode 26, along with other improvements and bug fixes.</p>
-            <p>For more details, please refer to the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.21-RC">changelog</a> or <a href="whatsnew-eap.md">What's new in Kotlin 2.2.21-RC</a>.</p>
+            <p>For more details, please refer to the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.21-RC2">changelog</a> or <a href="whatsnew2220.md">What's new in Kotlin 2.2.20</a>.</p>
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