inspector: update --inspect hint text

[LiviaMedeiros]

Changes link hint text:

$ node --inspect -e ""
Debugger listening on ws://127.0.0.1:9229/0f2c936f-b1cd-4ac9-aab3-f63b0f33d55e
For help, see: https://nodejs.org/en/docs/inspector

This would temporarily unbreak test/internet/test-inspector-help-page.js

Refs: nodejs/nodejs.org#5624
The guide link might be gone in foreseeable future, so this hint should probably be replaced with something else.
Suggestions are very welcome.

[ovflowd]

I think it's better if I just keep the redirect working for now, rather than updating the source. Because we can point that redirect to anywhere.

[ovflowd]

But it is important to mention that it will be gone in the foreseeable future.

[LiviaMedeiros]

The issue (404 link) is fixed by restoring redirect nodejs/nodejs.org#5626, thanks!

The questions that still belong here, assuming that the guide might be absent at some point, are:

• should we keep the link, or replace with verbose text, or remove it
• should we make the test

  node/test/internet/test-inspector-help-page.js

  Line 31 in f1b3ade

  assert.match(result, />Debugging Guide</);

  less dependent on the contents of current guide