the code in ch16 not working in my wim

[sicong-li]

:normal! ?^==\+$<cr>:nohlsearch<cr>kvg_

Topic One
 =========

This is some text about topic one.

It has multiple paragraphs.

Topic Two
=========

This is some text about topic two.  It has only one paragraph.

and when I type this command in my vim there have nothing happened
And my vim version is: 8.2.2029