Fix Az.CustomProviders Syntax Errors (#17525)

Author: v-yuzhichen

src/CustomProviders/help/New-AzCustomProvider.md

@@ -39,7 +39,7 @@ Create a custom resource provider
 
 ### Example 2: Create a custom provider with associations
 ```powershell
-New-AzCustomProvider -ResourceGroupName myRG -Name Namespace2.Type -Location "West US 2" -ResourceType @{Name="CustomRoute1"; Endpoint="https://www.contoso.com/"}, @{Name="Associations"; Endpoint="https://contoso.com/myService", RoutingType="Proxy,Cache,Extension"}
+New-AzCustomProvider -ResourceGroupName myRG -Name Namespace2.Type -Location "West US 2" -ResourceType @{Name="CustomRoute1"; Endpoint="https://www.contoso.com/"}, @{Name="Associations"; Endpoint="https://contoso.com/myService"; RoutingType="Proxy,Cache,Extension"}
 ```
 
 ```output