Update lib-sized.md

Author: andrew-johnson-4

lib-sized.md

@@ -1,7 +1,12 @@
 
 ### hash : Sized<size> -> Bool;
 
+The hash is not a cryptographic hash.
+
 ### is : (Sized<size>,Sized<size>) -> Bool;
 
-### mem-is-nonzero : Sized<size> -> Bool;
+`is` checks for binary equality of two memory regions.
+
+### mem-is-non-zero : Sized<size> -> Bool;
 
+`mem-is-non-zero` checks if a memory region is zeroed out.