Fixes for README.md

[abias]

Hi Dan,

I just started working with this tool and have some fixes for README.md:

• On https://github.com/moodlehq/moodle-db-oracle#see-also, the link to docker-moodle should go to https://github.com/moodlehq/moodle-docker and be labeled "moodle-docker"

Thanks,
Alex

[danpoltawski]

Thanks Alex, this is a regression from moodlehq/moodle-docker#16

I will fix this shortly, but if you want to do a pull request, i'll be happy to merge this too.

[abias]

Done. I lazily edited the files in Github directly.

[danpoltawski]

Fixed by #3