patch 8.2.0122: readme files still mention MS-DOS

Problem:    Readme files still mention MS-DOS.
Solution:   Update readme files. (Ken Takata, closes #5486)
diff --git a/READMEdir/README_w32s.txt b/READMEdir/README_w32s.txt
index 9bf0a67..742a655 100644
--- a/READMEdir/README_w32s.txt
+++ b/READMEdir/README_w32s.txt
@@ -1,15 +1,6 @@
 README_w32s.txt for version 8.2 of Vim: Vi IMproved.
 
-This archive contains the gvim.exe that was specifically compiled for use in
-the Win32s subsystem in MS-Windows 3.1 and 3.11.
-
-Also see the README_bindos.txt, README_dos.txt and README.txt files.
-
-Be careful not to overwrite the Win32s gvim.exe with the another gvim.exe when
-unpacking another binary archive!  Check the output of ":version":
-	Win32s - "MS-Windows 16/32 bit GUI version"
-	 Win32 - "MS-Windows 32 bit GUI version"
-Win32 with OLE - "MS-Windows 32 bit GUI version with OLE support"
-
-For further information, type this inside Vim:
-	:help win32s
+This file used to explain the installation of Vim on MS-Windows 3.1 and 3.11
+systems.  However, support for MS-Windows 3.1 and 3.11 has been removed in
+patch 7.4.1364.
+See "README.txt" for general information about Vim.