Update dependency ex_doc to ~> 0.40.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ex_doc (source)	dev	minor	~> 0.39.0 → ~> 0.40.0

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Release Notes

elixir-lang/ex_doc (ex_doc)

v0.40.0

Compare Source

• 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

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