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/repeat.txt b/runtime/doc/repeat.txt
index 69371db..91c4502 100644
--- a/runtime/doc/repeat.txt
+++ b/runtime/doc/repeat.txt
@@ -414,13 +414,13 @@
 the <t_xx> termcap codes, these can only be used in mappings.
 
 							*:source_crnl* *W15*
-MS-DOS, Win32 and OS/2: Files that are read with ":source" normally have
-<CR><NL> <EOL>s.  These always work.  If you are using a file with <NL> <EOL>s
-(for example, a file made on Unix), this will be recognized if 'fileformats'
-is not empty and the first line does not end in a <CR>.  This fails if the
-first line has something like ":map <F1> :help^M", where "^M" is a <CR>.  If
-the first line ends in a <CR>, but following ones don't, you will get an error
-message, because the <CR> from the first lines will be lost.
+Win32: Files that are read with ":source" normally have <CR><NL> <EOL>s.
+These always work.  If you are using a file with <NL> <EOL>s (for example, a
+file made on Unix), this will be recognized if 'fileformats' is not empty and
+the first line does not end in a <CR>.  This fails if the first line has
+something like ":map <F1> :help^M", where "^M" is a <CR>.  If the first line
+ends in a <CR>, but following ones don't, you will get an error message,
+because the <CR> from the first lines will be lost.
 
 Mac Classic: Files that are read with ":source" normally have <CR> <EOL>s.
 These always work.  If you are using a file with <NL> <EOL>s (for example, a