lib/database: Fixed a bug in database_connection_url that was created by d95bd6f's changes

7e79d9139f931e45f732de9a39cc54bedd95bd6f's changes simplified the usage of database_connection_url_mysql and database_connection_url_postgresql without making the proper changes to database_connection_url.

Signed-off-by: Tal Kain <tal.kain@ravellosystems.com>
Fixed a documentation typo

Signed-off-by: Tal Kain <tal.kain@ravellosystems.com>