PCI/doc: Update obsolete pci_set_dma_mask() references

The function is dma_set_mask(), fix a missed instance of the old
pci_set_dma_mask() and a reference to a function that doesn't exist.

Fixes: 05b0ebd0 ("PCI/doc: cleanup references to the legacy PCI DMA API")
Link: https://lore.kernel.org/r/165048747271.2959320.13475081883467312497.stgit@omenSigned-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Documentation/PCI/pci.rst

@@ -273,12 +273,12 @@ Set the DMA mask size
 While all drivers should explicitly indicate the DMA capability
 (e.g. 32 or 64 bit) of the PCI bus master, devices with more than
 32-bit bus master capability for streaming data need the driver
-to "register" this capability by calling pci_set_dma_mask() with
+to "register" this capability by calling dma_set_mask() with
 appropriate parameters.  In general this allows more efficient DMA
 on systems where System RAM exists above 4G _physical_ address.
 
 Drivers for all PCI-X and PCIe compliant devices must call
-set_dma_mask() as they are 64-bit DMA devices.
+dma_set_mask() as they are 64-bit DMA devices.
 
 Similarly, drivers must also "register" this capability if the device
 can directly address "coherent memory" in System RAM above 4G physical