pci: fix several trivial typos in comment

Signed-off-by: NChen Fan <chen.fan.fnst@cn.fujitsu.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

include/hw/pci/pci.h

@@ -137,7 +137,7 @@ enum {
 #define PCI_CONFIG_HEADER_SIZE 0x40
 /* Size of the standard PCI config space */
 #define PCI_CONFIG_SPACE_SIZE 0x100
-/* Size of the standart PCIe config space: 4KB */
+/* Size of the standard PCIe config space: 4KB */
 #define PCIE_CONFIG_SPACE_SIZE  0x1000
 
 #define PCI_NUM_PINS 4 /* A-D */

include/hw/pci/pcie_aer.h

@@ -51,7 +51,7 @@ struct PCIEAERLog {
     PCIEAERErr *log;
 };
 
-/* aer error message: error signaling message has only error sevirity and
+/* aer error message: error signaling message has only error severity and
    source id. See 2.2.8.3 error signaling messages */
 struct PCIEAERMsg {
     /*