patch 8.2.4891: Vim help presentation could be better

Problem:    Vim help presentation could be better.
Solution:   Add an imported file for extra Vim help support.  Show highlight
            names in the color they have.
diff --git a/src/version.c b/src/version.c
index d5b3333..57dec85 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4891,
+/**/
     4890,
 /**/
     4889,