Update flutter.dev links from misc packages to more permanent destinations (#150532)

Contributes to https://github.com/flutter/website/issues/10363

examples/README.md

@@ -22,7 +22,7 @@ Available examples include:
 
 - **Platform Channel** The [platform channel app](platform_channel) demonstrates
   how to connect a Flutter app to platform-specific APIs. For documentation, see
-  <https://flutter.dev/platform-channels/>.
+  <https://flutter.dev/to/platform-channels/>.
 
 - **Platform Channel Swift** The [platform channel swift
   app](platform_channel_swift) is the same as [platform

examples/flutter_view/README.md

@@ -6,7 +6,7 @@ Android, the Android and Flutter components are built with Android Studio or
 Gradle.
 
 You can read more about
-[accessing platform and third-party services in Flutter](https://flutter.dev/platform-services/).
+[accessing platform and third-party services in Flutter](https://flutter.dev/to/platform-channels/).
 
 ## iOS
 

examples/platform_channel/README.md

@@ -3,7 +3,7 @@
 This project demonstrates how to connect a Flutter app to platform-specific services.
 
 You can read more about
-[accessing platform and third-party services in Flutter](https://flutter.dev/platform-channels/).
+[accessing platform and third-party services in Flutter](https://flutter.dev/to/platform-channels/).
 
 ## iOS
 You can use the commands `flutter build` and `flutter run` from the app's root

examples/platform_channel_swift/README.md

@@ -5,7 +5,7 @@ services on iOS using Swift. The equivalent version of this project in
 Objective C is found in examples/platform_channel.
 
 You can read more about
-[accessing platform and third-party services in Flutter](https://flutter.dev/platform-channels/).
+[accessing platform and third-party services in Flutter](https://flutter.dev/to/platform-channels/).
 
 ## iOS