PCI: fix __pci_device_probe kernel-doc warning

Fix kernel-doc warning for __pci_device_probe():

Warning(drivers/pci/pci-driver.c:341): missing initial short description on line:
 * __pci_device_probe()

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>