Bug 14397: Fix tiny typo in database documentation

Bug 14397: Fix tiny typo in database documentation

Fixes Foriegn to Foreign.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 89a058787a58295193a60c1a1fbb8b5b5262e7ed)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
(cherry picked from commit ede83df30b3a8f7c52ae8a2ba6de99fde3117953)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>