Move RS-232 status under debug. Fix #2 from list.

docs/command_reference.md

@@ -8,7 +8,6 @@ UART0 and authenticated `admin` SSH sessions use the same registered command imp
 |---|---|
 | `memory` | Show free memory, minimum free memory, and largest blocks for internal RAM, DMA-capable RAM, and PSRAM. |
 | `reboot` | Drain console output briefly and restart the ESP32. |
-| `status` | Show quick MAX3243 signal state. |
 
 ## Role-based users
 
@@ -150,6 +149,7 @@ UART0 and admin SSH use shared whole-line Tab completion. A unique/common prefix
 
 | Command | Description |
 |---|---|
+| `debug status` | Show MAX3243 driver, receiver, VLD, and shutdown states. It requires UART1 to be stopped. |
 | `debug transceiver <enable|disable>` | Enable or shut down the MAX3243. |
 | `debug drivers <tx 0|1> <dtr 0|1> <rts 0|1>` | Drive static TX, DTR, and RTS logic levels for measurement. |
 | `debug loopback-a` / `debug loopback-b` | Test MAX3243 driver/receiver loopback configurations. |