fix: move windows specific info to note

Author: AnnsAnns

doc/guides/getting-started/flashing.mdx

@@ -17,9 +17,11 @@ board. The guide should mostly apply to all other boards as well.
     documentation of the board to check if extra steps are required.
 :::
 
-This assumes that the USB UART bridge of the ESP32 development board has
-been attached to WSL and VS Code has been launched from within WSL by running
-`code .` inside the RIOT repository from the Ubuntu terminal.
+:::tip[Flashing under WSL]
+    If you are using Windows, this assumes that the USB UART bridge of the ESP32 development board has
+    been attached to WSL and VS Code has been launched from within WSL by running
+    `code .` inside the RIOT repository from the Ubuntu terminal.
+:::
 
 ![VS Code in WSL](img/08-Flash_Real_Hardware-03.png)
 
@@ -91,7 +93,7 @@ It is also possible to install a native Windows flash application and invoke tha
 However, the setup is too board specific to be covered here. Please refer to the documentation of the board you are using.
 :::
 
-:::caution[Known Issues under WSL]
+:::caution[Known Issues under Windows]
     The Linux Kernel in WSL currently has
     [`CONFIG_USB_HIDDEV` disabled][wsl-hid-issue]. Hence, programmers using HID
     as transport do not work for now and fail to flash. The (non-conclusive) list of affected