update domain docs

[jlewitt1]

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: runhouse/resources/hardware/on_demand_cluster.py

Function	Unhandled Issue
up	TypeError: argument of type 'NoneType' is not iterable main in <m... Event Count: 1

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[jlewitt1]

• update domain docs #812 👈
• main

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