scsi: megaraid_sas: Update function description

Function parameter 'pdev 'is described as Generic Device Structure. It is a
PCI device structure.

Link: https://lore.kernel.org/r/20201102164730.324035-4-vaibhavgupta40@gmail.comSigned-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -7958,7 +7958,7 @@ static void megasas_detach_one(struct pci_dev *pdev)
 
 /**
  * megasas_shutdown -	Shutdown entry point
- * @pdev:		Generic device structure
+ * @pdev:		PCI device structure
  */
 static void megasas_shutdown(struct pci_dev *pdev)
 {