Bump html-proofer from 3.9.2 to 3.9.3 in /docs
Bump html-proofer from 3.9.2 to 3.9.3 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.9.2 to 3.9.3.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.9.2...v3.9.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sjackman/homebrew,Linuxbrew/brew,Homebrew/brew,MikeMcQuaid/brew,vitorgalvao/brew,konqui/brew,mahori/brew,JCount/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,reitermarkus/brew,reitermarkus/brew,nandub/brew,sjackman/homebrew,konqui/brew,mahori/brew,mahori/brew,EricFromCanada/brew,JCount/brew,reitermarkus/brew,nandub/brew,claui/brew,vitorgalvao/brew,nandub/brew,claui/brew,EricFromCanada/brew,Homebrew/brew,konqui/brew,vitorgalvao/brew,sjackman/homebrew,sjackman/homebrew,mahori/brew,claui/brew,Linuxbrew/brew,nandub/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,reitermarkus/brew,vitorgalvao/brew,JCount/brew,Linuxbrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,EricFromCanada/brew,Linuxbrew/brew,Homebrew/brew