Documentation update for prettier v3?

[kyle-blair]

Before I open a pull request, I wanted to confirm that functionality is now slightly different from the current README.

I upgraded prettier to v3 and was getting the error:
[error] No parser could be inferred for file "/path/to/xml/file.xml".

I was able to fix this by adding the following plugin section to my .prettierrc file:

    "plugins": ["@prettier/plugin-xml"]

This wasn't entirely obvious anywhere in the documentation either here or in the main prettier repo. I think it would be useful to mention here now that plugin search has been disabled in prettier v3?

[kddnewton]

I think it's documented pretty clearly under the plugins section? https://prettier.io/docs/en/plugins#using-plugins

But yes, please open a PR for the README here, that would be great.

[kyle-blair]

Ah, I glossed over this line

Strings provided to plugins are ultimately passed to import() expression, so you can provide a module/package name, a path, or anything else import() takes.

I tried a few things unsuccessfully (plugin-xml, prettier-plugin-xml) before using the full npm package name (@prettier/plugin-xml). The README here implied it should "just work", which threw me off a little longer. I'll open a PR asap. Thanks.

[kddnewton]

Fixes on main