Add simple docker command for upgrading firmware (Koenkk#1622)

* Add simple docker command for upgrading firmware

Add simple docker command for upgrading firmware by cc2538-bsl

* Update flashing_via_cc2538-bsl.md

* Update flashing_via_cc2538-bsl.md

Co-authored-by: Koen Kanters <[email protected]>

Author: Entepotenz

docs/guide/adapters/flashing/flashing_via_cc2538-bsl.md

@@ -8,7 +8,19 @@ CC2538-bsl is a python script by [Jelmer Tiete](https://github.com/JelmerT) that
 
 In this case we use a Sonoff Zigbee 3.0 USB Dongle Plus and flash the firmware without opening the case to press the "Boot" button.
 
-## Prepare your system (debian based)
+## Method with Docker (Linux only)
+```bash
+docker run --rm \
+    --device /dev/ttyUSB0:/dev/ttyUSB0 \
+    -e FIRMWARE_URL=https://github.com/Koenkk/Z-Stack-firmware/raw/master/coordinator/Z-Stack_3.x.0/bin/CC1352P2_CC2652P_launchpad_coordinator_20220219.zip \
+    ckware/ti-cc-tool -ewv -p /dev/ttyUSB0 --bootloader-sonoff-usb
+```
+
+You can find details on the Docker command [here](https://github.com/git-developer/ti-cc-tool)
+
+## Method without Docker
+
+### Prepare your system (debian based)
 
 1. Install python and python-pip.  
 ```bash 
@@ -18,7 +30,7 @@ sudo apt update && sudo apt install python3 python3-pip
 ```bash
 sudo pip3 install pyserial intelhex
 ```
-## Download cc2538-bsl
+### Download cc2538-bsl
 3. Create a directory named "cc2538-bsl", download the last master of cc2538-bsl as tarball and extract in same folder.  
 ```bash
 mkdir cc2538-bsl
@@ -28,7 +40,7 @@ curl -sSL https://github.com/JelmerT/cc2538-bsl/archive/refs/heads/master.tar.gz
 
 The sonoff feature is in the master since 20.01.2022.  
 
-## Download the Firmware  
+### Download the Firmware  
 Download the firmware for your adapter from the [Supported adapter page](../README.md) and unzip it in the `c2538-bsl` directory. So everything needed is in one folder.  
 
 4. In this case we will flash `CC1352P2_CC2652P_launchpad_coordinator_***.zip`.
@@ -60,7 +72,7 @@ Write 104 bytes at 0x00057F988
 Verifying by comparing CRC32 calculations.
     Verified (match: 0xe0c256fd)
 ```
-## How-to check the installed firmware version
+### How-to check the installed firmware version
 Zigbee2MQTT will output the installed firmware version to the Zigbee2MQTT log on startup:
 ```
 Zigbee2MQTT:info  2022-01-05 22:36:34: Coordinator firmware version: '{"meta":{"maintrel":1,"majorrel":2,"minorrel":7,"product":1,"revision":20220219,"transportrev":2},"type":"zStack3x0"}''