zha.permit clarification (home-assistant#7930)

This clarifies the steps necessary to perform the `zha.permit` service for those new to Home Assistant.

source/_components/zha.markdown

@@ -64,4 +64,8 @@ database_path:
   type: string
 {% endconfiguration %}
 
-To add new devices to the network, call the `permit` service on the `zha` domain, and then follow the device instructions for doing a scan or factory reset. In case you want to add Philips Hue bulbs that have previously been added to another bridge, have a look at: [https://github.com/vanviegen/hue-thief/](https://github.com/vanviegen/hue-thief/)
+To add new devices to the network, call the `permit` service on the `zha` domain. Do this by clicking the Service icon in Developer tools and typing `zha.permit` in the **Service** dropdown box. Next, follow the device instructions for adding, scanning or factory reset. 
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+In case you want to add Philips Hue bulbs that have previously been added to another bridge, have a look at: [https://github.com/vanviegen/hue-thief/](https://github.com/vanviegen/hue-thief/)
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