(AzureCXP) Fix Asterik issue in cmdlet

Fix Asterik issue to in $JitPolicy text used for cmdlet Set-AzJitNetworkAccessPolicy under https://docs.microsoft.com/en-us/azure/security-center/security-center-just-in-time#jit-vm-access-via-powershell
------- 
cc: @memildin

Author: SaurabhSharma-MSFT

articles/security-center/security-center-just-in-time.md

@@ -211,13 +211,13 @@ Run the following in PowerShell to accomplish this:
          id="/subscriptions/SUBSCRIPTIONID/resourceGroups/RESOURCEGROUP/providers/Microsoft.Compute/virtualMachines/VMNAME"
         ports=(@{
              number=22;
-             protocol="*";
-             allowedSourceAddressPrefix=@("*");
+             protocol="\*";
+             allowedSourceAddressPrefix=@("\*");
              maxRequestAccessDuration="PT3H"},
              @{
              number=3389;
-             protocol="*";
-             allowedSourceAddressPrefix=@("*");
+             protocol="\*";
+             allowedSourceAddressPrefix=@("\*");
              maxRequestAccessDuration="PT3H"})})
 
 2.    Insert the VM just-in-time VM access policy to an array:
@@ -270,4 +270,4 @@ To learn more about Security Center, see the following:
 - The Microsoft Learn module [Protect your servers and VMs from brute-force and malware attacks with Azure Security Center](https://docs.microsoft.com/learn/modules/secure-vms-with-azure-security-center/)
 - [Setting security policies](tutorial-security-policy.md) — Learn how to configure security policies for your Azure subscriptions and resource groups.
 - [Managing security recommendations](security-center-recommendations.md) — Learn how recommendations help you protect your Azure resources.
-- [Security health monitoring](security-center-monitoring.md) — Learn how to monitor the health of your Azure resources.
+- [Security health monitoring](security-center-monitoring.md) — Learn how to monitor the health of your Azure resources.