Man pages matching name probe::tcpmib.insegs in section 3stap:

probe::tcpmib.InSegs.3stap.en	debian 10 / systemtap-doc
probe::tcpmib.InSegs.3stap.en	debian 11 / systemtap-doc
probe::tcpmib.InSegs.3stap.en	debian 12 / systemtap-doc