Improve Wrap/Unwrap sample (Azure#37000)

* Update Sample6_WrapUnwrap.md

Show the base64 encoded key as it was shown upon creation to compare apples to apples

* Show the original value in base64

Author: SeanFeldman

sdk/keyvault/Azure.Security.KeyVault.Keys/samples/Sample6_WrapUnwrap.md

@@ -61,7 +61,7 @@ Now unwrap the encrypted key. Note that the same algorithm must always be used f
 
 ```C# Snippet:KeysSample6UnwrapKey
 UnwrapResult unwrapResult = cryptoClient.UnwrapKey(KeyWrapAlgorithm.RsaOaep, wrapResult.EncryptedKey);
-Debug.WriteLine($"Decrypted data using the algorithm {unwrapResult.Algorithm}, with key {unwrapResult.KeyId}. The resulting decrypted data is {Encoding.UTF8.GetString(unwrapResult.Key)}");
+Debug.WriteLine($"Decrypted data using the algorithm {unwrapResult.Algorithm}, with key {unwrapResult.KeyId}. The resulting decrypted data is {Convert.ToBase64String(unwrapResult.Key)}");
 ```
 
 [DefaultAzureCredential]: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/README.md

sdk/keyvault/Azure.Security.KeyVault.Keys/tests/samples/Sample6_WrapUnwrap.cs

@@ -55,7 +55,7 @@ public void WrapUnwrapSync()
 
             #region Snippet:KeysSample6UnwrapKey
             UnwrapResult unwrapResult = cryptoClient.UnwrapKey(KeyWrapAlgorithm.RsaOaep, wrapResult.EncryptedKey);
-            Debug.WriteLine($"Decrypted data using the algorithm {unwrapResult.Algorithm}, with key {unwrapResult.KeyId}. The resulting decrypted data is {Encoding.UTF8.GetString(unwrapResult.Key)}");
+            Debug.WriteLine($"Decrypted data using the algorithm {unwrapResult.Algorithm}, with key {unwrapResult.KeyId}. The resulting decrypted data is {Convert.ToBase64String(unwrapResult.Key)}");
             #endregion
 
             DeleteKeyOperation operation = keyClient.StartDeleteKey(rsaKeyName);