fix misleading hash claim

src/ch08-03-hash-maps.md

@@ -207,8 +207,8 @@ loop, so all of these changes are safe and allowed by the borrowing rules.
 
 ### Hashing Functions
 
-By default, `HashMap` uses a “cryptographically strong”[^siphash] hashing
-function that can provide resistance to Denial of Service (DoS) attacks. This
+By default, `HashMap` uses a hashing function called SipHash that can provide 
+resistance to Denial of Service (DoS) attacks involving hash tables[^siphash]. This
 is not the fastest hashing algorithm available, but the trade-off for better
 security that comes with the drop in performance is worth it. If you profile
 your code and find that the default hash function is too slow for your