Update policy-csp-authentication.md

Update to add description of new ConfigureWebSignInAllowedUrls policy.
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@ -37,6 +37,9 @@ manager: dansimp
<dd>
<a href="#authentication-allowsecondaryauthenticationdevice">Authentication/AllowSecondaryAuthenticationDevice</a>
</dd>
<dd>
<a href="#authentication-configurewebsigninallowedurls">Authentication/ConfigureWebSignInAllowedUrls</a>
</dd>
<dd>
<a href="#authentication-enablefastfirstsignin">Authentication/EnableFastFirstSignIn</a>
</dd>
@ -359,6 +362,68 @@ The following list shows the supported values:
<hr/>
<!--Policy-->
<a href="" id="authentication-configurewebsigninallowedurls"></a>**Authentication/ConfigureWebSignInAllowedUrls**
<!--SupportedSKUs-->
<table>
<tr>
<th>Windows Edition</th>
<th>Supported?</th>
</tr>
<tr>
<td>Home</td>
<td><img src="images/crossmark.png" alt="cross mark" /></td>
</tr>
<tr>
<td>Pro</td>
<td><img src="images/checkmark.png" alt="check mark" /><sup>4</sup></td>
</tr>
<tr>
<td>Business</td>
<td><img src="images/checkmark.png" alt="check mark" /><sup>4</sup></td>
</tr>
<tr>
<td>Enterprise</td>
<td><img src="images/checkmark.png" alt="check mark" /><sup>4</sup></td>
</tr>
<tr>
<td>Education</td>
<td><img src="images/checkmark.png" alt="check mark" /><sup>4</sup></td>
</tr>
</table>
<!--/SupportedSKUs-->
<hr/>
<!--Scope-->
[Scope](./policy-configuration-service-provider.md#policy-scope):
> [!div class = "checklist"]
> * Device
<hr/>
<!--/Scope-->
<!--Description-->
Available in Windows 10, version 1803. Specifies the list of domains that are allowed to be navigated to in AAD PIN reset and Web Sign-in Windows device scenarios where authentication is handled by AD FS or a 3rd party federated identity provider. Note this policy is required in federated environments as a mitigation to the vulnerability described in [CVE-2021-27092](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27092).
Example: If your organization's PIN reset or Web Sign-in authentication flow is expected to navigate to two domains, accounts.contoso.com and signin.contoso.com, the policy value should be "accounts.contoso.com;signin.contoso.com".
<!--/Description-->
<!--SupportedValues-->
<!--/SupportedValues-->
<!--Example-->
<!--/Example-->
<!--Validation-->
<!--/Validation-->
<!--/Policy-->
<hr/>
<!--Policy-->
<a href="" id="authentication-enablefastfirstsignin"></a>**Authentication/EnableFastFirstSignIn**