PCI: endpoint: pci-epf-vntb: Fix typo in comments

Replace "Span" with "Spad".

Link: https://lore.kernel.org/r/20221214172254.668282-1-Frank.Li@nxp.com
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

Author: nxpfrankli

drivers/pci/endpoint/functions/pci-epf-vntb.c

@@ -84,15 +84,15 @@ enum epf_ntb_bar {
  * |                                                  |
  * |                                                  |
  * |                                                  |
- * +-----------------------+--------------------------+ Base+span_offset
+ * +-----------------------+--------------------------+ Base+spad_offset
  * |                       |                          |
- * |    Peer Span Space    |    Span Space            |
+ * |    Peer Spad Space    |    Spad Space            |
  * |                       |                          |
  * |                       |                          |
- * +-----------------------+--------------------------+ Base+span_offset
- * |                       |                          |     +span_count * 4
+ * +-----------------------+--------------------------+ Base+spad_offset
+ * |                       |                          |     +spad_count * 4
  * |                       |                          |
- * |     Span Space        |   Peer Span Space        |
+ * |     Spad Space        |   Peer Spad Space        |
  * |                       |                          |
  * +-----------------------+--------------------------+
  *       Virtual PCI             PCIe Endpoint