Merge branch 'v3.8.x'
# Conflicts:
# scripts/release/steps/show-instructions-after-npm-publish.js
# src/language-markdown/print/children.js
# tests/format/markdown/commonmark-test-suite/__snapshots__/format.test.js.snap
# tests/format/markdown/list/__snapshots__/format.test.js.snap
# tests/format/mdx/mdx/__snapshots__/format.test.js.snap
