Incorrect link under 16 in metadata key description

[vismayajochem]

Description of the issue

The provided example link in the https://github.com/OpenEnergyPlatform/oemetadata/blob/develop/metadata/latest/metadata_key_description.md under 16 (https://databus.dbpedia.org/kurzum/mastr/bnetza-mastr/01.04.00) leads to an error 404: Not Found

Steps to Reproduce

1. Click on the link

Ideas of solution

Find the correct link and replace the false one with it.

Context and Environment

• Version used:
• Operating system:
• Environment setup and (python) version:

Workflow checklist

• [ ] I am aware of the workflow in CONTRIBUTING.md