fix: correct some typo

Signed-off-by: James Lu <[email protected]>

types/types.go

@@ -57,8 +57,8 @@ const (
 	// For lock mechanism, please refer to: https://github.com/longhorn/longhorn/blob/master/enhancements/20200701-backupstore-file-locks.md#proposal
 	// Currently the lock file is stored in each BackupVolume folder.
 	// For BackingImage Lock it is also stored there with the folder name "BACKINGIMAGE" defined here.
-	// To prevent Longhorn from accidently considering it as another normal BackupVolume,
-	// we use upppercase here so it will be filtered out when listing.
+	// To prevent Longhorn from accidentally considering it as another normal BackupVolume,
+	// we use uppercase here so it will be filtered out when listing.
 	BackupBackingImageLockName = "BACKINGIMAGE"
 )