Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index dad011a..7771ed2 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -419,7 +419,7 @@
 	/*
 	 * Possible cases:
 	 *   1) DM_RH_DIRTY
-	 *   2) DM_RH_NOSYNC: was dirty, other preceeding writes failed
+	 *   2) DM_RH_NOSYNC: was dirty, other preceding writes failed
 	 *   3) DM_RH_RECOVERING: flushing pending writes
 	 * Either case, the region should have not been connected to list.
 	 */