Documentation: PCI: correct spelling

Correct spelling problems for Documentation/PCI/ as reported
by codespell.

Link: https://lore.kernel.org/linux-pci/20230209071400.31476-14-rdunlap@infradead.org


Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>