Provide a way of adding a description below title

Some of the sections need a description below the top-most header in each file.

Instead of running:

mod-ansible-autodoc --todo-title "### TODO" --actions-title "## Features" --tags-title "### Tags" --variables-title "## Variables"

I would like to run:

mod-ansible-autodoc --todo-title "### TODO" --actions-title "## Features" --actions-description "This is a description." --tags-title "### Tags" --variables-title "## Variables"

Which would yield:

## ACTIONS
This is a description.
#### Ensures Android Studio is installed:
* Installs Android Studio on Linux using snap 
* Installs Android Studio on Windows using chocolatey 
* Installs Android Studio on macOS using Homebrew 
* Installs Android Studio on Archlinux, CentOS, Debian, Fedora, macOS, Ubuntu, and Windows
#### Ensures configured Android SDKs are present:
* Downloads a configurable list of Android SDKs 
* Ensures Android SDK tools like `adb` are present in the PATH

Please implement this for all 4 section types.

If there are no entries for the section then the file should still show up as blank.

Please also create good documentation for this repository.