fixed type on example #3

Author: sajal-mukherjee-git

src/ResourceManager/ApiManagement/Commands.ApiManagement/help/Set-AzureRmApiManagementPolicy.md

@@ -64,7 +64,7 @@ This command sets the product-scope policy for API Management.
 ### Example 3: Set API-scope policy
 ```
 PS C:\>$apimContext = New-AzureRmApiManagementContext -ResourceGroupName "Api-Default-WestUS" -ServiceName "contoso"
-PS C:\>Get-AzureRmApiManagementPolicy -Context $apimContext -ApiId "9876543210" -Policy $PolicyString
+PS C:\>Set-AzureRmApiManagementPolicy -Context $apimContext -ApiId "9876543210" -Policy $PolicyString
 ```
 
 This command sets API-scope policy for API Management.