[DOC] Fix Dev Dependencies Install Command

[jgyasu]

This PR fixes the development-dependencies installation command so that it works universally across all terminals and operating systems. While setting up a development environment on macOS, I discovered that the common command pip install -e .[dev] fails on zsh, the default shell on macOS, because zsh interprets the square brackets as a glob pattern instead of passing them to pip. This results in errors such as “no matches found.”

To ensure compatibility on macOS, Linux, and Windows, this PR updates the documentation and scripts to use the correctly quoted form:

pip install -e ".[dev]"

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.