Update README for packages that moved to Azure SDK (#27783)

* Update README for packages that moved to Azure SDK

* Update PatchConfig.props

Author: BrennanConroy

eng/PatchConfig.props

@@ -79,6 +79,8 @@ Later on, this will be checked using this condition:
   </PropertyGroup>
   <PropertyGroup Condition=" '$(VersionPrefix)' == '2.1.24' ">
     <PackagesInPatch>
+      Microsoft.AspNetCore.DataProtection.AzureKeyVault;
+      Microsoft.AspNetCore.DataProtection.AzureStorage;
     </PackagesInPatch>
   </PropertyGroup>
 </Project>

src/DataProtection/AzureKeyVault/src/Microsoft.AspNetCore.DataProtection.AzureKeyVault.csproj

@@ -1,7 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <Description>Microsoft Azure KeyVault key encryption support.</Description>
+    <Description>Microsoft Azure KeyVault key encryption support.
+
+    This library has been replaced by the following new Azure SDK.
+
+    https://www.nuget.org/packages/Azure.Extensions.AspNetCore.DataProtection.Keys
+
+    It is recommended that you move to the new package.
+    </Description>
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;dataprotection;azure;keyvault</PackageTags>

src/DataProtection/AzureStorage/src/Microsoft.AspNetCore.DataProtection.AzureStorage.csproj

@@ -1,7 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <Description>Microsoft Azure Blob storage support as key store.</Description>
+    <Description>Microsoft Azure Blob storage support as key store.
+
+    This library has been replaced by the following new Azure SDK.
+
+    https://www.nuget.org/packages/Azure.Extensions.AspNetCore.DataProtection.Blobs
+
+    It is recommended that you move to the new package.
+    </Description>
     <TargetFramework>netstandard2.0</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>