patch 9.1.0402: filetype: mdd files detected as zsh filetype

Problem:  filetype: mdd files detected as zsh filetype
Solution: detect '*.mdd' files as sh filetype, add links
          to reference documentation (Wu, Zhenyu)

closes: #14741

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index d166268..a8f4787 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    402,
+/**/
     401,
 /**/
     400,