PCI: Fix MPS peer-to-peer DMA comment syntax

Correct minor wording issue in MPS peer-to-peer comment.  Noticed by Don
Dutile.
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

@@ -1620,7 +1620,7 @@ void pcie_bus_configure_settings(struct pci_bus *bus)
 		return;
 
 	/* FIXME - Peer to peer DMA is possible, though the endpoint would need
-	 * to be aware to the MPS of the destination.  To work around this,
+	 * to be aware of the MPS of the destination.  To work around this,
 	 * simply force the MPS of the entire system to the smallest possible.
 	 */
 	if (pcie_bus_config == PCIE_BUS_PEER2PEER)