fix: fix comment linter lint violations in Linux-only code (#16118)

https://github.com/openai/codex/pull/16071 took care of this for
Windows, so this takes care of things for Linux.

We don't touch the CI jobs in this PR because
https://github.com/openai/codex/pull/16106 is going to be the real fix
there (including a major speedup!).

codex-rs/exec/tests/suite/sandbox.rs

@@ -51,9 +51,9 @@ async fn spawn_command_under_sandbox(
         command_cwd,
         sandbox_policy,
         sandbox_cwd,
-        false,
+        /*use_legacy_landlock*/ false,
         stdio_policy,
-        None,
+        /*network*/ None,
         env,
     )
     .await