doc: coolpi: Fix the defconfig name

The defconfig name should be: coolpi-cm5-genbook-rk3588_defconfig

Signed-off-by: Andy Yan <andyshrk@163.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
1 file changed