Update plugin development documentation for pyproject.toml

[arthanson]

Change Type

Addition

Area

Plugins

Proposed Changes

https://docs.netbox.dev/en/stable/plugins/development/ Specifically "Development Installation" section covers using setup.py, but pyproject.toml is the new suggested format and the documentation can include a line to use

pip install -e ./

[github-actions]

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[jeremystretch]

@arthanson can I assign this to you?