Hint #1: OpenBSD documentation for ports and packages can be found primarily in two places. a) FAQ 15, on general function of the package tools and ports tree, and b) installed when a package is installed, or posted as an installation message, or both.
Hint #2: The gnome-session package places a README file for OpenBSD on your system when you install it. You will probably find it here:
/usr/local/share/doc/pkg-readmes/gnome-session
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