Update application-gateway-end-to-end-ssl-powershell.md

Removed references to "whitelist"

Author: EvanBasalik

articles/application-gateway/application-gateway-end-to-end-ssl-powershell.md

@@ -39,7 +39,7 @@ This scenario will:
 
 To configure end-to-end SSL with an application gateway, a certificate is required for the gateway and certificates are required for the back-end servers. The gateway certificate is used to derive a symmetric key as per SSL protocol specification. The symmetric key is then used encrypt and decrypt the traffic sent to the gateway. The gateway certificate needs to be in Personal Information Exchange (PFX) format. This file format allows you to export the private key that is required by the application gateway to perform the encryption and decryption of traffic.
 
-For end-to-end SSL encryption, the back end must be whitelisted with the application gateway. Upload the public certificate of the back-end servers to the application gateway. Adding the certificate ensures that the application gateway only communicates with known back-end instances. This further secures the end-to-end communication.
+For end-to-end SSL encryption, the back end must be explicitly allowed by the application gateway. Upload the public certificate of the back-end servers to the application gateway. Adding the certificate ensures that the application gateway only communicates with known back-end instances. This further secures the end-to-end communication.
 
 The configuration process is described in the following sections.
 
@@ -165,7 +165,7 @@ All configuration items are set before creating the application gateway. The fol
    > If you are using host headers and Server Name Indication (SNI) on the back end, the retrieved public key might not be the intended site to which traffic flows. If you're in doubt, visit https://127.0.0.1/ on the back-end servers to confirm which certificate is used for the *default* SSL binding. Use the public key from that request in this section. If you are using host-headers and SNI on HTTPS bindings and you do not receive a response and certificate from a manual browser request to https://127.0.0.1/ on the back-end servers, you must set up a default SSL binding on the them. If you do not do so, probes fail and the back end is not whitelisted.
 
    ```powershell
-   $authcert = New-AzApplicationGatewayAuthenticationCertificate -Name 'whitelistcert1' -CertificateFile C:\cert.cer
+   $authcert = New-AzApplicationGatewayAuthenticationCertificate -Name 'allowlistcert1' -CertificateFile C:\cert.cer
    ```
 
    > [!NOTE]