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/Filelist b/Filelist
index bc44866..af5fcc5 100644
--- a/Filelist
+++ b/Filelist
@@ -722,6 +722,7 @@
 		runtime/doc/xxd.1 \
 		runtime/ftoff.vim \
 		runtime/gvimrc_example.vim \
+		runtime/import/dist/vimhelp.vim \
 		runtime/macros/README.txt \
 		runtime/macros/editexisting.vim \
 		runtime/macros/hanoi/click.me \