* fix: adjacent JSX elements should be allowed in mdx
* chore: update CHANGELOG.unreleased.md for PR
* fix: adjacent JSX elements format issue of line
* fix: get html text from ast correctly
* fix: self closing issue
* fix: finally find out how to get original text from position
* chore: reset unnecessary changes
* fix: additional text after jsx should also be allowed
* fix: regression of empty text
* docs: add missing links
* fix linting...
Sometimes we need to transform the ast to make it easier to print, but it's currently done in the parser (markdown and yaml), which leads the output ast harder to use for external users (custom parser), adding `printer.preprocess` can solve this issue.
And also this way we could move the trailing newline for json from `ast-to-doc.js` to `language-js`.