Update runtime files
diff --git a/runtime/syntax/help.vim b/runtime/syntax/help.vim
index aa76906..e38c90d 100644
--- a/runtime/syntax/help.vim
+++ b/runtime/syntax/help.vim
@@ -1,7 +1,7 @@
" Vim syntax file
" Language: Vim help file
" Maintainer: Bram Moolenaar (Bram@vim.org)
-" Last Change: 2022 May 15
+" Last Change: 2022 Sep 26
" Quit when a (custom) syntax file was already loaded
if exists("b:current_syntax")
@@ -44,6 +44,7 @@
syn match helpVim "VIM REFERENCE.*"
syn match helpOption "'[a-z]\{2,\}'"
syn match helpOption "'t_..'"
+syn match helpNormal "'ab'"
syn match helpCommand "`[^` \t]\+`"hs=s+1,he=e-1 contains=helpBacktick
syn match helpCommand "\(^\|[^a-z"[]\)\zs`[^`]\+`\ze\([^a-z\t."']\|$\)"hs=s+1,he=e-1 contains=helpBacktick
syn match helpHeader "\s*\zs.\{-}\ze\s\=\~$" nextgroup=helpIgnore