update: add youtube videos to whatsnew22 and whatsnew2220

Author: sarahhaggarty

docs/topics/whatsnew/whatsnew22.md

@@ -130,6 +130,10 @@ We would appreciate your feedback on our issue tracker, [YouTrack](https://youtr
 
 Kotlin 2.2.0 introduces an implementation of context-sensitive resolution in preview.
 
+You can find an overview of this feature in this video:
+
+<video src="https://www.youtube.com/v/aF8RYQrJI8Q" title="Context-sensitive resolution in Kotlin 2.2.0"/>
+
 Previously, you had to write the full name of enum entries or sealed class members, even when the type could be inferred from the context.
 For example:
 
@@ -334,6 +338,12 @@ For more information about the new defaulting rules for annotation use-site targ
 ### Support for nested type aliases
 <primary-label ref="beta"/>
 
+Kotlin 2.2.0 adds support for defining type aliases inside other declarations.
+
+You can find an overview of this feature in this video:
+
+<video src="https://www.youtube.com/v/1W6d45IOwWk" title="Nested type aliases in Kotlin 2.2.0"/>
+
 Previously, you could only declare [type aliases](type-aliases.md) at the top level of a Kotlin file. This meant 
 that even internal or domain-specific type
 aliases had to live outside the class where they were used.
@@ -572,6 +582,10 @@ fun main() {
 
 Kotlin 2.2.0 introduces a new experimental annotation: [`@JvmExposeBoxed`](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.jvm/-jvm-expose-boxed/). This annotation makes it easier to consume [inline value classes](inline-classes.md) from Java.
 
+You can find an overview of this feature in this video:
+
+<video src="https://www.youtube.com/v/KSvq7jHr1lo" title="Exposed inline value classes for Java in Kotlin 2.2.0"/>
+
 By default, Kotlin compiles inline value classes to use **unboxed representations**, which are more performant but often 
 hard or even impossible to use from Java. For example:
 

docs/topics/whatsnew/whatsnew2220.md

@@ -2,12 +2,7 @@
 
 _[Released: September 10, 2025](releases.md#release-details)_
 
-> Share your thoughts on Kotlin!
-> 
-> [Take our Kotlin Developer Survey](https://surveys.jetbrains.com/s3/7e238a7b85e5). It only takes about 10 minutes. 
-> Your feedback helps us improve the language, tools, and ecosystem.
-> 
-{style="note"}
+<tldr><p>For details about bug fix release 2.2.21, see the <a href="https://github.com/JetBrains/kotlin/releases/tag/v2.2.21">changelog</a></p></tldr>
 
 The Kotlin 2.2.20 release is out, delivering important changes for web development. [Kotlin/Wasm is now Beta](#kotlin-wasm),
 with improvements to [exception handling in JavaScript interop](#improved-exception-handling-in-kotlin-wasm-and-javascript-interop),
@@ -25,6 +20,10 @@ Additionally, here are some main highlights:
 >
 {style="note"}
 
+You can also find a short overview of the updates in this video:
+
+<video src="https://www.youtube.com/v/QWpp5-LlTqA" title="What's new in Kotlin 2.2.21"/>
+
 ## IDE support
 
 The Kotlin plugin that supports Kotlin 2.2.20 is bundled in the latest versions of IntelliJ IDEA and Android Studio.