* Leave a note about the httpd selinux restrictions

Traces might be missing, crashes might happen, appsec may not work properly, ... unless that line is added to SELinux config.

* fixing code block in callout

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Co-authored-by: aliciascott <alicia.scott@datadoghq.com>
Co-authored-by: Alicia Scott <aliciascott@users.noreply.github.com>