Updated changelogs and pipelines configs

pipelines/android-release.yml

@@ -1,4 +1,4 @@
-# Xamarin.Android
+# Android pipeline config
 
 trigger:
   branches:

pipelines/validation.yml

@@ -1,7 +1,4 @@
-# Xamarin.Android
-# Build a Xamarin.Android project.
-# Add steps that test, sign, and distribute an app, save build artifacts, and more:
-# https://docs.microsoft.com/azure/devops/pipelines/languages/xamarin
+# Pull request validation pipeline config
 
 trigger:
 - master

pipelines/windows-release.yml

@@ -1,4 +1,4 @@
-# Universal Windows Platform
+# Universal Windows Platform pipeline config
 
 trigger:
   branches:
@@ -61,7 +61,7 @@ steps:
   displayName: 'Copy changelog to output'
   inputs:
     SourceFolder: '$(Build.SourcesDirectory)/changelogs'
-    Contents: 'windows.txt'
+    Contents: 'windows.json'
     TargetFolder: '$(outputDirectory)'
 
 - task: PublishBuildArtifacts@1