remove broken link (#3100)

Author: mairaw

xml/System.Windows.Media.Media3D/RayHitTestParameters.xml

@@ -25,7 +25,6 @@
  ]]></format>
     </remarks>
     <altmember cref="M:System.Windows.Media.VisualTreeHelper.HitTest(System.Windows.Media.Media3D.Visual3D,System.Windows.Media.HitTestFilterCallback,System.Windows.Media.HitTestResultCallback,System.Windows.Media.Media3D.HitTestParameters3D)" />
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
   </Docs>
   <Members>
     <Member MemberName=".ctor">
@@ -58,7 +57,6 @@
  ]]></format>
         </remarks>
         <altmember cref="M:System.Windows.Media.VisualTreeHelper.HitTest(System.Windows.Media.Media3D.Visual3D,System.Windows.Media.HitTestFilterCallback,System.Windows.Media.HitTestResultCallback,System.Windows.Media.Media3D.HitTestParameters3D)" />
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="Direction">
@@ -100,7 +98,6 @@
  ]]></format>
         </remarks>
         <altmember cref="M:System.Windows.Media.VisualTreeHelper.HitTest(System.Windows.Media.Media3D.Visual3D,System.Windows.Media.HitTestFilterCallback,System.Windows.Media.HitTestResultCallback,System.Windows.Media.Media3D.HitTestParameters3D)" />
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="Origin">
@@ -142,7 +139,6 @@
  ]]></format>
         </remarks>
         <altmember cref="M:System.Windows.Media.VisualTreeHelper.HitTest(System.Windows.Media.Media3D.Visual3D,System.Windows.Media.HitTestFilterCallback,System.Windows.Media.HitTestResultCallback,System.Windows.Media.Media3D.HitTestParameters3D)" />
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
   </Members>

xml/System.Windows.Media.Media3D/SpecularMaterial.xml

@@ -33,7 +33,6 @@
   
  ]]></format>
     </remarks>
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
   </Docs>
   <Members>
     <MemberGroup MemberName=".ctor">
@@ -70,7 +69,6 @@
   
  ]]></format>
         </remarks>
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -103,7 +101,6 @@
   
  ]]></format>
         </remarks>
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="Brush">
@@ -148,7 +145,6 @@
   
  ]]></format>
         </remarks>
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="BrushProperty">
@@ -276,7 +272,6 @@
   
  ]]></format>
         </remarks>
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="ColorProperty">
@@ -372,7 +367,6 @@
   
  ]]></format>
         </remarks>
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=159959">3-D Hit Testing Sample</related>
       </Docs>
     </Member>
     <Member MemberName="SpecularPowerProperty">