missed doc update from BasedHardware#2129

Author: skywinder

docs/docs/docs/developer/firmware/Compile_firmware.mdx

@@ -24,7 +24,7 @@ Note that this is not the `latest` version of the NRF Connect toolchain or SDK.
 ### Step 2: Open the Firmware Application
 
 1. Open **nRF Connect Extension** inside VS Code.
-2. Click "Open an existing application" and navigate to the `firmware/firmware` folder in the root of this repository.
+2. Click "Open an existing application" and navigate to the `firmware/firmware/app` folder in the root of this repository.
 
    <img
      src="/images/docs/developer/images/install_firmware_screenshot_1.png"