When a header includes two `_`s, they must be escaped, otherwise, the
text between the two `_`s is rendered with emphasis. E.g.,
`<h1 id="etchostsallow">etc<em>hosts</em>allow</h1>`
Escaping the `_`s fixes this and the header is rendered properly.
This is a fix for:
* etc_hosts_allow
* etc_hosts_deny
* postgres_hba_conf
* postgres_ident_conf
This change also adds the `h1` title to the windows_hotfix resource
page.
Signed-off-by: Nathen Harvey <nharvey@chef.io>