[openstreetmap-website] Fix url to documentation of db setup (#503)

[Simon Legner]

You can merge this Pull Request by running:

  git pull https://github.com/simon04/openstreetmap-website fix-db-setup-url

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/503

-- Commit Summary --

  * Fix url to documentation of db setup

-- File Changes --

    M config/example.database.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/503.patch
https://github.com/openstreetmap/openstreetmap-website/pull/503.diff
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