Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/scsi/scsi-changer.txt b/Documentation/scsi/scsi-changer.txt
index 032399b..ade046e 100644
--- a/Documentation/scsi/scsi-changer.txt
+++ b/Documentation/scsi/scsi-changer.txt
@@ -102,7 +102,7 @@
 
 If you insmod the driver with "insmod debug=1", it will be verbose and
 prints a lot of stuff to the syslog.  Compiling the kernel with
-CONFIG_SCSI_CONSTANTS=y improves the quality of the error messages alot
+CONFIG_SCSI_CONSTANTS=y improves the quality of the error messages a lot
 because the kernel will translate the error codes into human-readable
 strings then.