chore(deps): bump ex_doc from 0.39.3 to 0.40.0 in the dev group

[dependabot]

Bumps the dev group with 1 update: ex_doc.

Updates ex_doc from 0.39.3 to 0.40.0

Changelog

Sourced from ex_doc's changelog.

v0.40.0 (2026-01-20)

• Enhancements

  • Introduce Markdown formatter (thanks to Yordis Prietro)
  • Generate a llms.txt document by default and add a "Copy Markdown" button to the top of every page
  • Run retriever only once per formatter
  • Support anchors on redirects

• Bug fixes

  • Copy button on erl and iex snippets now include prompts
  • Fix headers having wrong selectors due to whitespace minification
  • Only include .html links on Swup

• Breaking changes

  • Revamp the ExDoc entrypoint and formatter API. While those have never been made public, others may have relied on it. We have now changed and documented them on the path to standardization
  • The previously deprecated :assets option will raise if given a string, pass a map instead

Commits

• c4fb876 Release v0.40.0
• 63cd82e Copy Markdown
• bc47206 Generate link to view markdown source
• 816216f Generate llms.txt instead of index.md
• df248dd Update dependencies
• 5cf7aef Start marking formatter API public
• 1c45645 Reduce the places we pass markdown globally and extend Erlang coverage
• 8958323 Update assets
• 70e674f Make ExDoc module public
• 3933afa Clean up naming in tests
• Additional commits viewable in compare view

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