fix broken links

Author: PhilKang0704

mac/samples/index.yml

@@ -16,11 +16,11 @@ sections:
      style: cards
      className: cardsW
      items:
-     - href: /samples/xamarin/xamarin-forms-samples/todo/
+     - href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        html: This sample demonstrates a Todo list application where the data is stored and accessed in a local SQLite database, built with Xamarin.Forms.
        image:
          src: ../media/samples/todo.png
-         href: /samples/xamarin/xamarin-forms-samples/todo/
+         href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        title: Todo
      - href: https://github.com/xamarinhq/app-myshoppe
        html: Demo app that empowers salespeople to track their sales performance, manage leads, view their contacts, manage orders, and browse the product catalog.
@@ -41,23 +41,23 @@ sections:
      style: cards
      className: cardsW
      items:
-     - href: /samples/xamarin/monodroid-samples/android50-googleio2014master/
+     - href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        html: This sample demonstrates the new Material Design APIs introduced in Android Lollipop.
        image:
          src: ../media/samples/material-design.png
-         href: /samples/xamarin/monodroid-samples/android50-googleio2014master/
+         href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        title: Material Design
-     - href: /samples/xamarin/monodroid-samples/googleplayservices/
+     - href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        html: This solution uses the Xamarin Google Play Services NuGet to demonstrate a few uses of the maps API.
        image:
          src: ../media/samples/gps.png
-         href: /samples/xamarin/monodroid-samples/googleplayservices/
+         href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        title: Google Play Services
-     - href: /samples/xamarin/monodroid-samples/userinterface-flashcardpager/
+     - href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        html: This sample demonstrates how to use ViewPager and PagerTabStrip together to implement an app that presents a series of math problems on flash cards.
        image:
          src: ../media/samples/flash.png
-         href: /samples/xamarin/monodroid-samples/userinterface-flashcardpager/
+         href: /samples/microsoft/surface-duo-sdk-xamarin-samples/all/
        title: Flash Card Pager
 
 - title: Xamarin.iOS
@@ -66,23 +66,23 @@ sections:
      style: cards
      className: cardsW
      items:
-     - href: /samples/xamarin/ios-samples/ios11-arkitplacingobjects/
+     - href: /previous-versions/xamarin/ios/get-started/
        html: ARKit augmented reality demo to place objects on detected surfaces.
        image:
          src: ../media/samples/arkit.png
-         href: /samples/xamarin/ios-samples/ios11-arkitplacingobjects/
+         href: /previous-versions/xamarin/ios/get-started/
        title: "ARKit (iOS 11)"
-     - href: /samples/xamarin/ios-samples/ios11-mapkitsample/
+     - href: /dotnet/api/mapkit?view=xamarin-ios-sdk-12
        html: "New iOS 11 features in MapKit: grouping and splitting markers based on zoom-level."
        image:
          src: ../media/samples/mapkit.png
-         href: /samples/xamarin/ios-samples/ios11-mapkitsample/
+         href: /dotnet/api/mapkit?view=xamarin-ios-sdk-12
        title: "MapKit (iOS 11)"
-     - href: /samples/xamarin/ios-samples/ios11-coremlazuremodel/
+     - href: /dotnet/api/coreml?view=xamarin-ios-sdk-12
        html: "iOS 11 Vision framework and CoreML, using a model trained with Azure's Custom Vision Service."
        image:
          src: ../media/samples/coremlazure.png
-         href: /samples/xamarin/ios-samples/ios11-coremlazuremodel/
+         href: /dotnet/api/coreml?view=xamarin-ios-sdk-12
        title: "CoreML & Azure (iOS 11)"
 
 - title: Xamarin.Mac
@@ -97,17 +97,17 @@ sections:
          src: ../media/samples/hellomac.png
          href: /xamarin/mac/get-started/hello-mac/
        title: "Hello, Mac"
-     - href: /samples/xamarin/mac-samples/maccontrols/
+     - href: /visualstudio/mac/samples/
        html: UI control examples for Mac apps.
        image:
          src: ../media/samples/controls.png
-         href: /samples/xamarin/mac-samples/maccontrols/
+         href: /visualstudio/mac/samples/
        title: "MacControls"
-     - href: /samples/xamarin/mac-samples/macimages/
+     - href: /visualstudio/mac/samples/
        html: UI control examples for Mac apps.
        image:
          src: ../media/samples/images.png
-         href: /samples/xamarin/mac-samples/macimages/
+         href: /visualstudio/mac/samples/
        title: "MacImages"