We currently have two subsections that - `Application layers` and `Application Layer Parsers` that could probably be merged into one. After that is settled, fix some of the sub-section titles that currently have the wrong markdown, causing them to be rendered as sub-subsections. (e.g. `SMB` - https://suricata.readthedocs.io/en/suricata-6.0.5/configuration/suricata-yaml.html#configure-smb). The attached file shows the SMB example. `SMB`).