patch 8.2.0017: OS/2 and MS-DOS are still mentioned

Problem:    OS/2 and MS-DOS are still mentioned, even though support was
            removed long ago.
Solution:   Update documentation. (Yegappan Lakshmanan, closes #5368)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 88a5448..1bed01f 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1,4 +1,4 @@
-*usr_41.txt*	For Vim version 8.2.  Last change: 2019 Nov 21
+*usr_41.txt*	For Vim version 8.2.  Last change: 2019 Dec 17
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -1699,8 +1699,8 @@
 elsewhere, but form a nice checklist.
 
 The end-of-line character depends on the system.  For Unix a single <NL>
-character is used.  For MS-DOS, Windows, OS/2 and the like, <CR><LF> is used.
-This is important when using mappings that end in a <CR>.  See |:source_crnl|.
+character is used.  For MS-Windows and the like, <CR><LF> is used.  This is
+important when using mappings that end in a <CR>.  See |:source_crnl|.
 
 
 WHITE SPACE
@@ -1885,7 +1885,7 @@
 by the plugin should be clear from its name.  And it should be unlikely that
 someone else writes a plugin with the same name but which does something
 different.  And please limit the name to 8 characters, to avoid problems on
-old Windows systems.
+old MS-Windows systems.
 
 A script that corrects typing mistakes could be called "typecorr.vim".  We
 will use it here as an example.