src: fix dead inspector help URL

The URL printed when running `node --inspect` pointed to
https://nodejs.org/en/docs/inspector which returns 404.

Update it to https://nodejs.org/api/inspector.html which is the
current location of the inspector API documentation.

Fixes: #62743

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: galaxy4276

src/inspector_socket_server.cc

@@ -248,7 +248,7 @@ void PrintDebuggerReadyMessage(
     }
   }
   fprintf(out, "For help, see: %s\n",
-          "https://nodejs.org/en/docs/inspector");
+          "https://nodejs.org/api/inspector.html");
   fflush(out);
 }