allegro5-doc binary package in Ubuntu Bionic amd64

 This package contains the Allegro documentation in various formats,
 FAQs and other documentation about the Allegro library, source of the
 example programs.
 .
 Allegro is a cross-platform library intended for use in computer games
 and other types of multimedia programming. Allegro 5 is the latest major
 revision of the library, designed to take advantage of modern hardware
 (e.g. hardware acceleration using 3D cards) and operating systems.
 Although it is not backwards compatible with earlier versions, it still
 occupies the same niche and retains a familiar style.

Source package