doc: headerlines not rendered correctly with extra backslash

[fhinkel]

Looks like something changed in how we render documentation for 8 vs 10. Headers used to need \ to escape special characters. Now the backslash is rendered and our docs look weird.
Here is an example, source:

### DEP0002: require('\_linklist')

How it looks in docs for 10 (here):

DEP0002: require('\_linklist')

 

 

How it looks in docs for 8 (here):

DEP0002: require('_linklist')

I think we can remove the extra \, .md files viewed on GitHub would render correctly.

cc @nodejs/website

[targos]

Duplicate of #22065

[lpinca]

PR #22084

[fhinkel]

Thanks @targos , I wasn't searching well enough 😄