PCI: document PCIe fundamental reset interfaces

The attached patch updates the Documentation/PCI/pci-error-recovery.txt
file with changes related to this new bit field, as well a few unrelated
updates.
Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Mike Mason <mmlnx@us.ibm.com>
Signed-off-by: Richard Lary <rlary@us.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>