Fix another typo in the FileTimeType docs

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@337900 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/DesignDocs/FileTimeType.rst b/docs/DesignDocs/FileTimeType.rst
index ed62a0a..4686e0a 100644
--- a/docs/DesignDocs/FileTimeType.rst
+++ b/docs/DesignDocs/FileTimeType.rst
@@ -224,7 +224,7 @@
 
   // Implicit truncation during conversion bug.
   intmax_t get_time_in_seconds(path p) {
-    using fs_seconds = duration<file_time_type::rep, /* default ration */>;
+    using fs_seconds = duration<file_time_type::rep, ratio<1, 1> >;
     auto tp = last_write_time(p);
 
     // This works with truncation for __int128_t, but what does it do for