directory-tree expand/collapse icon switching

[jonirouAtTalan]

Hello,

For example on this page https://docs.typo3.org/permalink/t3sitepackage:typoscript-import-configuration the icon to expand a folder is a "-" and to collapse a folder the icon is a "+".

It is confusing, i think this should be better to switch the two icon.

The code used for this is :

..  directory-tree::
    :level: 4
    :show-file-icons: true

    *   EXT:my_site_package/Configuration

        *   Sets

            *   SitePackage

                *   config.yaml
                *   setup.typoscript

        *   TypoScript

            *   Setup

                *   pageview.typoscript

Thank you