Update runtime files.
diff --git a/runtime/doc/usr_23.txt b/runtime/doc/usr_23.txt
index 73a0679..b124b34 100644
--- a/runtime/doc/usr_23.txt
+++ b/runtime/doc/usr_23.txt
@@ -29,8 +29,8 @@
When computers came out, storage was expensive. Some people decided that
they did not need two characters for end-of-line. The UNIX people decided
they could use <Line Feed> only for end-of-line. The Apple people
-standardized on <CR>. The MS-DOS (and Microsoft Windows) folks decided to
-keep the old <CR><LF>.
+standardized on <CR>. The Microsoft Windows folks decided to keep
+the old <CR><LF>.
This means that if you try to move a file from one system to another, you
have line-break problems. The Vim editor automatically recognizes the
different file formats and handles things properly behind your back.