Placeholder Text in Code of Conduct

[martinpeck]

https://github.com/data-privacy-stack/MVG/blob/main/org-docs/CODE-OF-CONDUCT.md#enforcement

The Enforcement section contains a placeholder where contact details should be specificed:

Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at [INSERT CONTACT METHOD]. All complaints will be reviewed and investigated promptly and fairly.