Merge branch 'bpf-add-the-missing-fsession'

Menglong Dong says:

====================
bpf: add the missing fsession

Add the missing fsession attach type to the BPF docs, verifier log and
bpftool.

Changes since v2:
- replace "FENTRY/FEXIT/FSESSION" with "Tracing" in the 1st patch
- v2: https://lore.kernel.org/all/20260408062109.386083-1-dongml2@chinatelecom.cn/

Changes since v1:
- add a missing FSESSION in bpf_check_attach_target() in the 1st patch
- v1: https://lore.kernel.org/all/20260408031416.266229-1-dongml2@chinatelecom.cn/
====================

Link: https://patch.msgid.link/20260412060346.142007-1-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>