Address PR feedback

Author: mredig

pico-blink-sdk/README.md

@@ -20,9 +20,11 @@ This example demonstrates how to integrate with the Pico SDK which is using CMak
 
 - Make sure you have a recent nightly Swift toolchain that has Embedded Swift support.
 - Build and copy the program in the UF2 format to the Mass Storage device to trigger flashing the program into memory (after which the device will reboot and run the firmware):
+  - (determining your toolchain identifier is step 5 in this [matter tutorial](https://apple.github.io/swift-matter-examples/tutorials/swiftmatterexamples/setup-macos/))
+
 ``` console
 $ cd pico-blink-sdk
-$ export TOOLCHAINS='<toolchain-name>'
+$ export TOOLCHAINS='<toolchain-identifier>'
 $ export PICO_BOARD=pico
 $ export PICO_SDK_PATH='<path-to-your-pico-sdk>'
 $ export PICO_TOOLCHAIN_PATH='<path-to-the-arm-toolchain>' # A default `brew` install will be located at `/Applications/ArmGNUToolchain/[version]/arm-none-eabi`

pico-blink/README.md

@@ -23,9 +23,10 @@ pip3 install -r requirements.txt
 ```
 
 - Build and copy the program in the UF2 format to the Mass Storage device to trigger flashing the program into memory (after which the device will reboot and run the firmware):
+  - (determining your toolchain identifier is step 5 in this [matter tutorial](https://apple.github.io/swift-matter-examples/tutorials/swiftmatterexamples/setup-macos/))
 ``` console
 $ cd pico-blink
-$ TOOLCHAINS='<toolchain-name>' ./build.sh # toolchain-name is typically `swift`
+$ TOOLCHAINS='<toolchain-identifier>' ./build.sh
 $ cp .build/blink.uf2 /Volumes/RP2040
 ```
 - The green LED should now be blinking in a pattern.