This is the official manual for the latest Org-mode release.
The end result of the Texinfo export process is the creation of an Info file.
This Info file's metadata has variables for category, title, and description:
#+TEXINFO_DIR_DESC that establish where in the Info hierarchy the file
Here's an example that writes to the ‘Top’ node:
#+TEXINFO_DIR_CATEGORY: Emacs #+TEXINFO_DIR_TITLE: Org Mode: (org) #+TEXINFO_DIR_DESC: Outline-based notes management and organizer