Update Start-AzJitNetworkAccessPolicy.md - Fix the Example to display the proper cmdlet being demonstrated (#13713)

* Update Start-AzJitNetworkAccessPolicy.md

The example for how to use Start-AzJitNetworkAccessPolicy showed how to use Set instead of Start.  This version includes how to use Start instead.

* Update Start-AzJitNetworkAccessPolicy.md

Co-authored-by: Yunchi Wang <[email protected]>

Author: PaulHCode

src/Security/Security/help/Start-AzJitNetworkAccessPolicy.md

@@ -40,19 +40,21 @@ The request will be logged in the policy for later review and will be terminated
 
 ### Example 1
 ```powershell
-PS C:\> Set-AzJitNetworkAccessPolicy -ResourceGroupName "myService1" -Location "centralus" -Name "default" -Kind "Basic" -VirtualMachine $vms
+$MyResource = Get-AzResource -Id /subscriptions/xxxxxxx-xxxxx-xxxxx-xxxxxxx/resourceGroups/PolicyDemo/providers/Microsoft.Compute/virtualMachines/PolicyDemoVM1
+$JitPolicy = (@{
+        id    = $MyResource.ResourceId; 
+        ports = (@{
+                number                     = 22
+                endTimeUtc                 = Get-Date (Get-Date -AsUTC).AddHours(1) -Format O
+                allowedSourceAddressPrefix = @($MyPublicIP) 
+            })
+    })
+$ActivationVM = @($JitPolicy)
+Start-AzJitNetworkAccessPolicy -ResourceGroupName $($MyResource.ResourceGroupName) -Location $MyResource.Location -Name "default" -VirtualMachine $ActivationVM
 
-Id                : /subscriptions/487bb485-b5b0-471e-9c0d-10717612f869/resourceGroups/myService1/providers/Microsoft.S
-                    ecurity/locations/centralus/jitNetworkAccessPolicies/default
-Name              : default
-Kind              : Basic
-VirtualMachines   : {/subscriptions/487bb485-b5b0-471e-9c0d-10717612f869/resourceGroups/myService1/providers/Microsoft.
-                    Compute/virtualMachines/testService}
-Requests          : {}
-ProvisioningState : Succeeded
 ```
 
-Opens up a network connection according to the specified connection request data.
+Opens up a network connection for 1 hour over port 22 from my public IP (not shown).
 
 ## PARAMETERS