Update documentation on tagging for jvm (Closes #599)

[mlvandijk]

Description

Update tag expressions in line with https://github.com/cucumber/tag-expressions

Motivation & context

Fixes #599

Type of change

• Refactoring/debt (improvement to code design or tooling without changing behaviour)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new behaviour)
• Breaking change (will cause existing functionality to not
  work as expected)

Remember to add an entry to the relevant section of CHANGELOG.md as part of this pull request.

Note to other contributors

If your change may impact future contributors, explain it here, and remember to update README.md and CONTRIBUTING.md accordingly.

Update required of cucumber.io/docs

If the Cucumber documentation will require an update,
submit an issue or ideally a pull request to cucumber/docs and
reference it here.

e.g. "Ref: cucumber/docs/pull/#99"

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have added tests to cover my changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.