Man pages matching name stapfuncs in section 3stap:

stapfuncs.3stap.en	debian 10 / systemtap-doc
stapfuncs.3stap.cs	debian 11 / systemtap-doc
stapfuncs.3stap.en	debian 11 / systemtap-doc
stapfuncs.3stap.cs	debian 12 / systemtap-doc
stapfuncs.3stap.en	debian 12 / systemtap-doc