Downloading the whole documentation for offline reading I found some "Not Found" errors on this links:

www.doctrine-project.org/images/btn-open.png (from www.doctrine-project.org/docs/dbal/2.0/en/_static/default.css)
www.doctrine-project.org/images/error.png (from www.doctrine-project.org/css/layout.css)

www.doctrine-project.org/docs/dbal/2.0/en/reference/types (from www.doctrine-project.org/docs/dbal/2.0/en/reference/data-retrieval-and-manipulation.html)
www.doctrine-project.org/docs/dbal/2.0/en/known-vendor-issues (from www.doctrine-project.org/docs/dbal/2.0/en/reference/types.html)
www.doctrine-project.org/docs/orm/2.0/en/reference/batch-processing (from www.doctrine-project.org/docs/orm/2.0/en/reference/dql-doctrine-query-language.html)