Update 1_3_Real_Case_db_setup.rst

Fixed ref: http://bazaar.launchpad.net/~openerp-community/openobject-doc/6.1/revision/1869/i18n/zh_hans/source/book/1/1_3_Real_Case/1_3_Real_Case_db_setup.rst#i18n/zh_hans/source/book/1/1_3_Real_Case/1_3_Real_Case_db_setup.rst