Fix broken links (dotnet#7960)

Author: gewarren

xml/System.Net.PeerToPeer.Collaboration/Peer.xml

@@ -36,17 +36,15 @@
       <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The purpose of the abstract <xref:System.Net.PeerToPeer.Collaboration.Peer> class is to provide a common base class definition that can be shared by derived classes such as <xref:System.Net.PeerToPeer.Collaboration.PeerNearMe> and <xref:System.Net.PeerToPeer.Collaboration.PeerContact>. It cannot be directly constructed, since it is abstract. Developers should use the subclasses PeerNearMe or PeerContact instead.  
+ The purpose of the abstract <xref:System.Net.PeerToPeer.Collaboration.Peer> class is to provide a common base class definition that can be shared by derived classes, such as <xref:System.Net.PeerToPeer.Collaboration.PeerNearMe> and <xref:System.Net.PeerToPeer.Collaboration.PeerContact>. It cannot be directly constructed, since it is abstract. Developers should use the subclasses `PeerNearMe` or `PeerContact` instead.  
   
  Contact, peer, remote peer, <xref:System.Net.PeerToPeer.Collaboration.PeerNearMe>, <xref:System.Net.PeerToPeer.Collaboration.ContactManager.LocalContact%2A>, and <xref:System.Net.PeerToPeer.Collaboration.PeerContact> are synonymous terms, based on context.  
   
- "Calling peer" and "remote peer" are commonly synonymous.  Calling peer does not refer to the application calling a given method.  
+ "Calling peer" and "remote peer" are commonly synonymous. Calling peer does not refer to the application calling a given method.  
   
  ]]></format>
     </remarks>
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=94462">Handling and Raising Events</related>
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink?LinkID=92916">Windows Address Book API Reference</related>
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink?LinkID=92964">Windows Contact Manager</related>
+    <related type="ExternalDocumentation" href="/uwp/api/Windows.ApplicationModel.Contacts.ContactManager">Windows ContactManager class</related>
   </Docs>
   <Members>
     <Member MemberName=".ctor">

xml/System.Net.PeerToPeer.Collaboration/PeerCollaborationPermission.xml

@@ -287,13 +287,13 @@ The parameter's version number is not supported.</exception>
   
  The following statements are required to be `true` for all implementations of the <xref:System.Net.PeerToPeer.Collaboration.PeerCollaborationPermission.IsSubsetOf%2A> method. X, Y, and Z represent <xref:System.Security.IPermission> objects that are not a `null` reference (`Nothing` in Visual Basic).  
   
--   X.IsSubsetOf(X) returns `true`.  
+- X.IsSubsetOf(X) returns `true`.  
   
--   X.IsSubsetOf(Y) returns the same value as Y.IsSubsetOf(X) if and only if X and Y represent the same set of permissions.  
+- X.IsSubsetOf(Y) returns the same value as Y.IsSubsetOf(X) if and only if X and Y represent the same set of permissions.  
   
--   If X.IsSubsetOf(Y) and Y.IsSubsetOf(Z) both return `true`, X.IsSubsetOf(Z) returns `true`.  
+- If X.IsSubsetOf(Y) and Y.IsSubsetOf(Z) both return `true`, X.IsSubsetOf(Z) returns `true`.  
   
- If X represents an empty [IPermission](https://go.microsoft.com/fwlink?LinkID=98303) object with a permission state of None and Y represents an IPermission object that is a `null` reference (`Nothing` in Visual Basic), X.IsSubsetOf(Y) returns `true`. If Z is also an empty permission, the compound set operation X.Union(Z).IsSubsetOf(Y) also returns `true` because the <xref:System.Net.PeerToPeer.Collaboration.PeerCollaborationPermission.Union%2A> of two empty permissions is an empty permission.  
+ If X represents an empty <xref:System.Security.IPermission> object with a permission state of `None`, and Y represents an `IPermission` object that is a `null` reference (`Nothing` in Visual Basic), X.IsSubsetOf(Y) returns `true`. If Z is also an empty permission, the compound set operation X.Union(Z).IsSubsetOf(Y) also returns `true` because the <xref:System.Net.PeerToPeer.Collaboration.PeerCollaborationPermission.Union%2A> of two empty permissions is an empty permission.  
   
  ]]></format>
         </remarks>

xml/System.Net.PeerToPeer/PeerNameRegistration.xml

@@ -488,7 +488,7 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets or sets the [TCP/IP](https://go.microsoft.com/fwlink?LinkID=98458) port number used by the peer being registered into the <see cref="T:System.Net.PeerToPeer.PeerNameRegistration" /> object.</summary>
+        <summary>Gets or sets the TCP/IP port number used by the peer being registered into the <see cref="T:System.Net.PeerToPeer.PeerNameRegistration" /> object.</summary>
         <value>An integer value indicating the TCP port number of the <see cref="T:System.Net.IPEndPoint" />. Unless explicitly specified, the default value for this property is zero (0).</value>
         <remarks>
           <format type="text/markdown"><![CDATA[  

xml/System.Net.PeerToPeer/PeerNameType.xml

@@ -23,7 +23,7 @@
   
  The format of a peer name is: *Authority.Classifier*. The value of <xref:System.Net.PeerToPeer.PeerName.Authority%2A> depends on whether the name is a secured peer name or an unsecured peer name. The <xref:System.Net.PeerToPeer.PeerName.Classifier%2A> part of the name can be set to any string that contains 15 or fewer Unicode characters, including the `null` terminator. Once the <xref:System.Net.PeerToPeer.PeerName.Authority%2A>, <xref:System.Net.PeerToPeer.PeerName.Classifier%2A> and security level of a peer have been established, a peer can also be referred to with a relative name or a host name.  
   
- Only the owner, or peer host, can register a secure peer name with the [PNRP Namespace Provider API](https://go.microsoft.com/fwlink?LinkID=92731). Any node can claim ownership to any unsecured <xref:System.Net.PeerToPeer.PeerName>.  
+ Only the owner, or peer host, can register a secure peer name with the [PNRP Namespace Provider API](/windows/win32/p2psdk/pnrp-namespace-provider-api). Any node can claim ownership to any unsecured <xref:System.Net.PeerToPeer.PeerName>.  
   
  **Note** Using a secured <xref:System.Net.PeerToPeer.PeerName> does not ensure the overall security of a networking application. Security of the application is implementation-dependent.  
   

xml/System.Net.PeerToPeer/PnrpPermission.xml

@@ -54,7 +54,7 @@
     <altmember cref="M:System.Net.PeerToPeer.PnrpPermission.FromXml(System.Security.SecurityElement)" />
     <altmember cref="T:System.Net.PeerToPeer.PnrpPermissionAttribute" />
     <altmember cref="N:System.Security.Permissions" />
-    <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink?LinkID=92731">PNRP Namespace Provider API</related>
+    <related type="ExternalDocumentation" href="/windows/win32/p2psdk/pnrp-namespace-provider-api">PNRP Namespace Provider API</related>
   </Docs>
   <Members>
     <Member MemberName=".ctor">
@@ -149,7 +149,7 @@ The parameter's version number is not supported.</exception>
         <altmember cref="M:System.Net.PeerToPeer.PnrpPermission.FromXml(System.Security.SecurityElement)" />
         <altmember cref="M:System.Net.PeerToPeer.PnrpPermission.ToXml" />
         <altmember cref="M:System.Net.PeerToPeer.PnrpPermission.Union(System.Security.IPermission)" />
-        <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink?LinkID=92731">PNRP Namespace Provider API</related>
+        <related type="ExternalDocumentation" href="/windows/win32/p2psdk/pnrp-namespace-provider-api">PNRP Namespace Provider API</related>
       </Docs>
     </Member>
     <Member MemberName="FromXml">