Added an example network_key line for configuration.yaml file.
I was having a hard time making it work because I was re-using an existing key from Razberry which was in a slightly different format. It wasn't until I "created" a new key to see the format.
* Z-Wave documents refactoring
* Continuing to update documentation for Z-Wave
* Wakeup correction
Note that it only applies to devices that can be battery powered (for example, my Aeotec sensor is USB powered, but as it supports Wake the option is shown)
* Polling impact notes
Example of what the impact of polling can be
* Fix object_id to entity_id
