Fixes#31286.
While our current implementation of help center renders the table
without those three dashes, our new help-beta using starlight needs
those 3 dashes there.
Before, the `span` opening tag was split between two lines. This
led to `[@mdx-js/rollup]` throwing an error on the build step saying
`Expected a closing tag for <span> before the end of paragraph`.
This is a preparatory commit for the migration to use starlight
for help center docs.