Bump ex_doc from 0.22.1 to 0.22.2
Bump ex_doc from 0.22.1 to 0.22.2

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.22.1 to 0.22.2.
- [Release notes](https://github.com/elixir-lang/ex_doc/releases)
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elixir-lang/ex_doc/compare/v0.22.1...v0.22.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
bors-ng/bors-ng,bors-ng/bors-ng,bors-ng/bors-ng