[PATCH v3 1/2] docs: landlock: clarify TTY signal scoping

[sashiko-bot at kernel.org]

> LANDLOCK_SCOPE_SIGNAL limits signals sent to arbitrary processes outside
> a domain.  A PTY master differs because its holder controls attached
> processes through input and signal injection.
> 
> Clarify this boundary in the userspace guide and narrow the UAPI
> description to arbitrary target processes.
> 
> Built the userspace-api docs; no new warnings.
> 
> Link: https://lore.kernel.org/r/20260916152336.1589383-1-clusk@northecho.dev
> Suggested-by: Günther Noack <gnoack at google.com>
> Suggested-by: Mickaël Salaün <mic at digikod.net>
> Assisted-by: Codex:gpt-5.6-sol
> Signed-off-by: Christopher Lusk <clusk at northecho.dev>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260923163321.79770-1-clusk@northecho.dev?part=1