Joomla Documentation Developer Portal needs to be updated

[max123kl]

This issue refers to the following page in the Joomla documentation: https://docs.joomla.org/Portal:Developers. The portal page in the Joomla documentation does not yet contain any information specific to the J4 version and does not yet contain a reference to the https://manual.joomla.org website.

The last minor change to the page was made in Apr 2020.

I am asking for suggestions on what obsolete content should be removed and what new information needs to be added. (With a JDoc account, the wiki can also be edited directly).