Update dependency ex_doc to v0.38.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ex_doc (source)	dev	patch	0.38.1 -> 0.38.2

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Release Notes

elixir-lang/ex_doc (ex_doc)

v0.38.2

Compare Source

• Bug fixes
  • Render documents with hardcoded <h2>/<h3> entries correctly
  • Fix padding on external links

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