Problem highlighting cword in help buffer (Text format)

Hi community,

I use this to highlight occurrences of the word when cursor is inside 
the word, and cancel the highlight when cursor is outside.

```
autocmd CursorMoved,CursorMovedI * execute 'match Visual' (getline('.')[col('.')-1] =~# '\w' ? '/\&lt;' . escape(expand('<cword>'), '/\.*$^~[]') . '\&gt;/' : '//')
```

When i `:help autocmd` and read lines like these:

` autocmd_add({replace: `
` autocmd_add(#{replace: `

(backticks are not part of them)

if I place cursor on ` autocmd_add ` or ` replace `, 
this whole string ` autocmd_add({replace: ` is highlighted as a whole 
wrongly, and this is wrong too ` autocmd_add(#{replace: `.

But when I open the file directly with vim:
` $ vi /usr/share/vim/vim90/doc/autocmd.txt `
` autocmd_add ` and ` replace ` are not highlighted together as a whole.

it seems that the pattern does not count ` ( `, ` # `, ` { ` as boundary 
of words in ` :help ` buffer. how can I fix it?

Thanks!</cword>

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