Add toolbox handedness instructions for Cradio (#15046)

Co-authored-by: filterpaper <filterpaper@localhost>

keyboards/cradio/readme.md

@@ -8,21 +8,25 @@ Cradio are low-profile 34-key split-keyboards designed by [@davidphilipbarr](htt
 
 * Keyboard Maintainer: [davidphilipbarr](https://github.com/davidphilipbarr)
 * Hardware Supported:
-    * [Sweep](https://github.com/davidphilipbarr/Sweep)
+    * [Sweep](https://github.com/davidphilipbarr/Sweep) (all versions)
     * [Hypergarlic](https://github.com/davidphilipbarr/hypergolic/tree/main/hypergarlic)
     * Variants of the same 34-key direct pin PCB
-* Hardware Availability: PCBs can be printed with gerber files from the repository
+* Hardware Availability: order PCBs with gerber files from the repository
 
-Make examples for this keyboard (after setting up your build environment):
+Make example for this keyboard (after setting up your build environment):
 
     make cradio:default
 
-Firmware uses `EE_HANDS` split handedness by default. Each halve should be flashed once with the following:
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Setting Handedness
+
+Keyboard uses [handedness by EEPROM](https://docs.qmk.fm/#/feature_split_keyboard?id=handedness-by-eeprom) as default. The make commands are:
 
     make cradio:default:dfu-split-left
     make cradio:default:dfu-split-right
 
-See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+[QMK Toolbox](http://qmk.fm/toolbox) can also be used to set EEPROM handedness. Place the controller in bootloader mode and select menu option Tools -> EEPROM -> Set Left/Right Hand
 
 ## Bootloader