feat: Kotlin 2.2.0-RC release details and What's new (#4844)

* This PR adds release details and What's new for Kotlin 2.2.0-RC

* chore: rephrase compiler option

Co-authored-by: Danil Pavlov <danil.pavlov@jetbrains.com>

* Andrey review

* chore: fix code sample

* chore: rephrase a sentence

---------

Co-authored-by: Danil Pavlov <danil.pavlov@jetbrains.com>

Author: AlejandraPedroza

docs/images/whatsnew/gradle-console-rich-output.png

@@ -34,7 +34,7 @@
 	<toc-element toc-title="What's new in Kotlin">
 		<toc-element toc-title="Kotlin 2.1.20" accepts-web-file-names="whatsnew.html" topic="whatsnew2120.md"/>
 		<toc-element toc-title="Kotlin 2.1.0" topic="whatsnew21.md"/>
-		<toc-element toc-title="Kotlin 2.2.0-Beta2" topic="whatsnew-eap.md"/>
+		<toc-element toc-title="Kotlin 2.2.0-RC" topic="whatsnew-eap.md"/>
 		<toc-element toc-title="Earlier versions">
 			<toc-element toc-title="Kotlin 2.0.20" topic="whatsnew2020.md"/>
 			<toc-element toc-title="Kotlin 2.0.0" topic="whatsnew20.md"/>

docs/kr.tree

@@ -54,13 +54,13 @@ In this channel, you can also get notifications about new EAP builds.
         <th>Build highlights</th>
     </tr>
     <tr>
-        <td><strong>2.2.0-Beta2</strong>
-            <p>Released: <strong>April 30, 2025</strong></p>
-            <p><a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta2" target="_blank">Release on GitHub</a></p>
+        <td><strong>2.2.0-RC</strong>
+            <p>Released: <strong>May 16, 2025</strong></p>
+            <p><a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-RC" target="_blank">Release on GitHub</a></p>
         </td>
         <td>
             <p>A language release with previews of new features and tooling updates.</p>
-            <p>For more details, please refer to the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-Beta2">changelog</a> or <a href="whatsnew-eap.md">What's new in Kotlin 2.2.0-Beta2</a>.</p>
+            <p>For more details, please refer to the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.0-RC">changelog</a> or <a href="whatsnew-eap.md">What's new in Kotlin 2.2.0-RC</a>.</p>
         </td>
     </tr>
 </table>