docs(website): update formatter options

[ematipico]

Summary

Closes #2362

Test Plan

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[cpojer]

Just curious, how did you settle on --write over defaulting to writing and having a --lint or similar command?

[ematipico]

Writing is a disruptive operation, regardless of what we write, and writing a file (especially in non-VCS projects) is always dangerous. We decided that the user should have intent overwriting files.

This is, for example, the same behaviour that prettier or clippy use. Once we will have VSC support for projects, --write can be alias for --allow-dirty, which it seems to be the standard option of allowing writing files when the current branch has uncommitted changes.

Rome classic had --allow-dirty for some commands, like rome init.

But at the moment we don't have knowledge of a project, so using what prettier does sounds reasonable.