document SIGUSR1 inspector activation#3388
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denoland/deno#35738 adds Node.js-compatible inspector activation via SIGUSR1:
on Linux and macOS, sending the signal to a running Deno process starts the
inspector server on the default 127.0.0.1:9229 without pausing execution.
This documents it on the debugging page, as a new "Sending SIGUSR1" subsection
under "Activating the inspector at runtime", covering the no-op behavior when
the inspector is already running, the short startup grace period, coexistence
with Deno.addSignalListener, and Windows not being supported.
The feature shipped in Deno 2.9.2.