Documentation: add failfs documentation

Document the failfs semantics, the FD_FAILFS_ROOT sentinel, the
fchroot() entry requirements, and the ways back out.

Link: https://patch.msgid.link/20260724-work-failfs-v2-7-485dabbae185@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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Christian Brauner 2026-07-24 15:41:23 +02:00
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