Rename to _update_zigbee_availability(), add docstring #6059

Job	Run time
Dependency	5s
Cache identify	5s
Shellcheck	7s
Prepare	7s
Ruff check and force	10s
Check commit	20s
Run pytest using Python 3.13	19s
Run pytest using Python 3.14	16s
Run mypy	13s
Process test coverage	15s
Process test complexity	12s
Build and publish Python 🐍 distributions 📦 to TestPyPI	9s
	2m 18s

Provide feedback