[ruby/prism] Document fewer useless methods/classesHEADmaster

(https://github.com/ruby/prism/pull/3908)

* Add missing nodocs for FFI

When generating docs in ruby/prism, this doesn't seem to matter.

But on docs.ruby-lang.org these take over the actual documentation.

* Nodoc various utility methods

They don't tell much of a story and just pull attention away from actually unique methods

* Nodoc some private functions/modules

* Nodoc translator implementation details

As well as some functionality from ripper that is nodoc in ruby

* Stop documenting visitor implementation details

These result in so many methods that are searchable
and give no actual benefit.
Toplevel docs are all you need to understand the usecase.

https://github.com/ruby/prism/commit/0bd9a7d373

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