explicit_bzero.c: fix comments
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
explicit_bzero.c: fix comments
does not provide memset_s() in 12.0 at least.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e