man.th.extra3.suppress — Suppress extra3 part of header/footer?
If the value of man.th.extra3.suppress
is
non-zero, then the extra3
part of the
.TH
title line header/footer is
suppressed.
The content of the extra3
field is usually
displayed in the middle header of the page and is typically a "manual
name"; for example, "GTK+ User's Manual" (from the
gtk-options(7)
man page).