patch 8.1.0541: help message in dosinst.c is outdated

Problem:    Help message in dosinst.c is outdated.
Solution:   Update the comment. (Ken Takata, closes #3626)
diff --git a/src/version.c b/src/version.c
index f3889b0..37f4b1f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    541,
+/**/
     540,
 /**/
     539,