Man pages matching name probe::nfsd.proc.write in section 3stap:

probe::nfsd.proc.write.3stap.en	debian 10 / systemtap-doc
probe::nfsd.proc.write.3stap.en	debian 11 / systemtap-doc
probe::nfsd.proc.write.3stap.en	debian 12 / systemtap-doc