CLEANUP: assorted typo fixes in the code and comments

This is 7th iteration of typo fixes
diff --git a/include/types/hlua.h b/include/types/hlua.h
index 4145086..28ed9bd 100644
--- a/include/types/hlua.h
+++ b/include/types/hlua.h
@@ -124,7 +124,7 @@
 	struct hlua_txn htxn;
 };
 
-/* This struc is used with sample fetches and sample converters. */
+/* This struct is used with sample fetches and sample converters. */
 struct hlua_smp {
 	struct stream *s;
 	struct proxy *p;