Use friendlier terminology in rubysocket.h comment

[Fix GH-2008]

From: Juanito Fatas <juanito.fatas@shopify.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65662 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/socket/rubysocket.h

@@ -408,7 +408,7 @@ NORETURN(void rsock_sys_fail_raddrinfo_or_sockaddr(const char *, VALUE addr, VAL
  * all cases.  For some syscalls (e.g. accept/accept4), blocking on the
  * syscall instead of relying on select/poll allows the kernel to use
  * "wake-one" behavior and avoid the thundering herd problem.
- * This is likely safe on all other *nix-like systems, so this whitelist
+ * This is likely safe on all other *nix-like systems, so this safe list
  * can be expanded by interested parties.
  */
 #if defined(__linux__)