Update docs for SelectOne to reflect the code.
Update docs for SelectOne to reflect the code.

losinggeneration/gorp,evenco/gorp,coopernurse/gorp,rickb777/gorp-old2,yp-engineering/gorp,gabelula/gorp,evenco/gorp,xiaoenai/gorp,cortex/gorp,gabelula/gorp,cortex/gorp,kevinc0825/gorm,outdoorsy/gorp,xiaoenai/gorp,kimxilxyong/gorp,GeertJohan/gorp,d-g-laptev/gorp,go-gorp/gorp,outdoorsy/gorp,d-g-laptev/gorp,mousesun/gorp,coopernurse/gorp,rickb777/gorp-old2,kevinc0825/gorm,losinggeneration/gorp,GeertJohan/gorp,mousesun/gorp,go-gorp/gorp,kimxilxyong/gorp,yp-engineering/gorp