CLEANUP: assorted typo fixes in the code and comments
This is 7th iteration of typo fixes
diff --git a/include/types/acl.h b/include/types/acl.h
index 3d44284..04318ea 100644
--- a/include/types/acl.h
+++ b/include/types/acl.h
@@ -42,7 +42,7 @@
* - FAIL : no mattern may ever match
*
* We assign values 0, 1 and 3 to FAIL, MISS and PASS respectively, so that we
- * can make use of standard arithmetics for the truth tables below :
+ * can make use of standard arithmetic for the truth tables below :
*
* x | !x x&y | F(0) | M(1) | P(3) x|y | F(0) | M(1) | P(3)
* ------+----- -----+------+------+----- -----+------+------+-----