docs: fix broken Node.js inspector URL in debugging guide (#94934)
## What
Updates one broken URL in the debugging guide that returns 404.
```diff
-For help, see: https://nodejs.org/en/docs/inspector
+For help, see: https://nodejs.org/api/inspector.html
```
The old path (`/en/docs/inspector`) no longer exists after Node.js
restructured their documentation site. The replacement points to the
current Node.js Inspector API docs which returns 200.
## Why
This URL appears inside a terminal output code block showing what the
Node.js debugger prints when launched with `--inspect`. A reader who
follows the link to learn more about the inspector gets a 404.
A related fix for the separate Debugging Guide link
(`/en/docs/guides/debugging-getting-started`) is tracked in #93958. This
PR addresses the second broken Node.js URL in the same file that #93958
did not cover.
## Checklist
- [x] Docs-only change. No behavior impact.
- [x] Replacement URL verified to return HTTP 200.
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