Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/scsi/pm8001/pm8001_hwi.h b/drivers/scsi/pm8001/pm8001_hwi.h
index 833a520..9091320 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.h
+++ b/drivers/scsi/pm8001/pm8001_hwi.h
@@ -209,7 +209,7 @@
 
 /*
  * brief the data structure of SATA Completion Response
- * use to discribe the sata task response (64 bytes)
+ * use to describe the sata task response (64 bytes)
  */
 struct sata_completion_resp {
 	__le32	tag;
@@ -951,7 +951,7 @@
 #define PCIE_EVENT_INTERRUPT		0x003044
 #define PCIE_ERROR_INTERRUPT_ENABLE	0x003048
 #define PCIE_ERROR_INTERRUPT		0x00304C
-/* signature defintion for host scratch pad0 register */
+/* signature definition for host scratch pad0 register */
 #define SPC_SOFT_RESET_SIGNATURE	0x252acbcd
 /* Signature for Soft Reset */