Man pages matching name xmcvttextpropertytoxmstringtable in section 3:

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