Update dependency ex_doc to v0.38.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ex_doc (source)	dev	patch	0.38.2 -> 0.38.3

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Release Notes

elixir-lang/ex_doc (ex_doc)

v0.38.3

Compare Source

• Enhancements
  • Allow configuring autocomplete limit, and default it to 10 instead of 8
  • Display description text in docs groups
  • Load discovered makeup apps for CLI

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