fix(blog): Add note about DTS output step.

* The DTS output step needs to be removed for the builds.

docs/blog/2022-04-02-zephyr-3-0.md

@@ -27,6 +27,15 @@ Existing user config repositories using Github Actions to build will pull down Z
 
 - Open `.github/workflows/build.yml` in your editor/IDE
 - Change `zmkfirmware/zmk-build-arm:2.5` to `zmkfirmware/zmk-build-arm:stable` wherever it is found
+- Locate and delete the lines for the DTS output step, which is no longer needed:
+
+    ```
+      - name: ${{ steps.variables.outputs.display-name }} DTS File
+        if: ${{ always() }}
+        run: |
+          if [ -f "build/zephyr/${{ matrix.board }}.pre.tmp" ]; then cat -n build/zephyr/${{ matrix.board }}.pre.tmp; fi
+          if [ -f "build/zephyr/zephyr.dts" ]; then cat -n build/zephyr/zephyr.dts; fi
+    ```
 
 :::note