Man pages matching name probe::nfs.fop.check_flags in section 3stap:

probe::nfs.fop.check_flags.3stap.en	debian 10 / systemtap-doc
probe::nfs.fop.check_flags.3stap.en	debian 11 / systemtap-doc
probe::nfs.fop.check_flags.3stap.en	debian 12 / systemtap-doc