build(deps-dev): bump rexml from 3.3.2 to 3.3.3 in /docs

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.2 to 3.3.3.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.2...v3.3.3)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

0.22.6

0.22.5

0.22.2

0.22.1

0.22.0

0.21.0

0.21.0-pre-release-1