Link to mocking guidance in XML docs for credential types (Azure#43960)

Author: scottaddie

sdk/identity/Azure.Identity/src/Credentials/AuthorizationCodeCredential.cs

@@ -29,7 +29,7 @@ public class AuthorizationCodeCredential : TokenCredential
         internal TenantIdResolverBase TenantIdResolver { get; }
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected AuthorizationCodeCredential()
         {

sdk/identity/Azure.Identity/src/Credentials/AzurePipelinesCredential.cs

@@ -25,7 +25,7 @@ public class AzurePipelinesCredential : TokenCredential
         private const string OIDC_API_VERSION = "7.1";
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected AzurePipelinesCredential()
         { }

sdk/identity/Azure.Identity/src/Credentials/ClientAssertionCredential.cs

@@ -25,7 +25,7 @@ public class ClientAssertionCredential : TokenCredential
         internal TenantIdResolverBase TenantIdResolver { get; }
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected ClientAssertionCredential()
         { }

sdk/identity/Azure.Identity/src/Credentials/ClientCertificateCredential.cs

@@ -41,7 +41,7 @@ public class ClientCertificateCredential : TokenCredential
         internal TenantIdResolverBase TenantIdResolver { get; }
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected ClientCertificateCredential()
         { }

sdk/identity/Azure.Identity/src/Credentials/ClientSecretCredential.cs

@@ -40,7 +40,7 @@ public class ClientSecretCredential : TokenCredential
         internal TenantIdResolverBase TenantIdResolver { get; }
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected ClientSecretCredential()
         {

sdk/identity/Azure.Identity/src/Credentials/ManagedIdentityCredential.cs

@@ -27,7 +27,7 @@ public class ManagedIdentityCredential : TokenCredential
             "See the troubleshooting guide for more information. https://aka.ms/azsdk/net/identity/managedidentitycredential/troubleshoot";
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected ManagedIdentityCredential()
         { }

sdk/identity/Azure.Identity/src/Credentials/OnBehalfOfCredential.cs

@@ -26,7 +26,7 @@ public class OnBehalfOfCredential : TokenCredential
         internal TenantIdResolverBase TenantIdResolver { get; }
 
         /// <summary>
-        /// Protected constructor for mocking.
+        /// Protected constructor for <see href="https://aka.ms/azsdk/net/mocking">mocking</see>.
         /// </summary>
         protected OnBehalfOfCredential()
         { }