Man pages matching name xmcreatebulletinboarddialog in section 3:

XmCreateBulletinBoardDialog.3.en	debian 10 / libmotif-dev
XmCreateBulletinBoardDialog.3.en	debian 11 / libmotif-dev
XmCreateBulletinBoardDialog.3.en	debian 12 / libmotif-dev