Install gnome-devel-docs by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-devel-docs
Description:
GNOME developer documentation
Documentation for developing for the GNOME desktop environment. It contains: * Platform Overview * Accessibility Guide * Integration Guide * Optimization Guide * Human Interface Guidelines * GNOME Developer Demos
Homepage: https://developer.gnome.org/
Version: 3.28.0-1
Section: universe/gnome