Adding "az apic " to the "import-from-apim" examples

Author: rmoreirao

articles/api-center/import-api-management-apis.md

@@ -255,15 +255,15 @@ In the following command, substitute the names of your API center, your API cent
 
 ```azurecli
 #! /bin/bash
-import-from-apim --service-name <api-center-name> --resource-group <resource-group-name> \
+az apic import-from-apim --service-name <api-center-name> --resource-group <resource-group-name> \
     --apim-name <api-management-name> --apim-resource-group <api-management-resource-group-name> \
     --apim-apis 'petstore-api'        
 ```
 
 
 ```azurecli
 # PowerShell syntax
-import-from-apim --service-name <api-center-name> --resource-group <resource-group-name> `
+az apic import-from-apim --service-name <api-center-name> --resource-group <resource-group-name> `
     --apim-name <api-management-name> --apim-resource-group <api-management-resource-group-name> `
     --apim-apis 'petstore-api'    
 ```