docs: clarify that prettier plugins must be explicitly enabled

[llllvvuu]

It's possible that auto-enabling all plugins was a previous feature, but it's not the case currently.

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[felipecrs]

It's possible that auto-enabling all plugins was a previous feature, but it's not the case currently.

I can confirm this.

[llllvvuu]

@JounQin saw you resolved the comment, is this PR mergeable?

[JounQin]

@JounQin saw you resolved the comment, is this PR mergeable?

Thanks for your contribution!