Install vala-0.40-doc by entering the following commands in the terminal:
sudo apt update sudo apt install vala-0.40-doc
Description:
C# like language for the GObject system - documentation
Vala is a new programming language that aims to bring modern programming language features to GNOME developers without imposing any additional runtime requirements and without using a different ABI compared to applications and libraries written in C. . This package contains the Vala Reference Manual.
Homepage: https://wiki.gnome.org/Projects/Vala/
Version: 0.40.4-1
Section: universe/doc