test: fix internet/test-inspector-help-page

The webpage at the URL referenced by `node --inspect` was retitled when
it was recently moved.

Update the test to match the new title "Debugging Node.js" (formerly
"Debugging Guide").

Refs: nodejs/nodejs.org#6265
PR-URL: #51693
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>

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

@@ -28,7 +28,7 @@ function check(url, cb) {
     });
 
     res.on('end', common.mustCall(() => {
-      assert.match(result, />Debugging Guide</);
+      assert.match(result, />Debugging Node\.js</);
       cb();
     }));
   })).on('error', common.mustNotCall);