gherkin java: Improved contributing documentation

[tsundberg]

Summary

The CONTRIBUTING.md wasn't clear on how to contribute.

Details

I updated the reference to the CONTRIBUTING.md that was missing. It pointed towards an old file in cucumber/gherkin.

The repository to clone was cucumber/gherkin which is obsolete. I changed it to say cucumber/cucumber instead.

Motivation and Context

The documentation confused me when I wanted to share another pull request. I thought I better update the documentation when I noticed the problem.

How Has This Been Tested?

I have done manual testing to verify that the updated links ends up where I expected them to end up.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• I've added tests for my code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[lock]

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