Missing commas in cors verbs dockerfile

[The recommended docker-compose file](https://dependencytrack.org/docker-compose.yml) and the docker-compose file displayed in [the docs page](https://docs.dependencytrack.org/getting-started/deploy-docker/) differ.
In particular there's a typo in the former, where cors verbs are not comma separated (see [this commit](https://github.com/DependencyTrack/dependency-track/commit/82a7f0636f3b86671d20b170e2d803c6b3faf313)).

Either fix this particular issue or make these two places reference the same content, so that future edits don't end up causing another fork.