docs: remove deprecated environment option from examples

docs/data/data.yaml

@@ -59,12 +59,10 @@ properties:
       steps:
         - name: Build
           image: quay.io/thegeeklab/wp-docker-buildx
-          environment:
-            CUSTOM_ENVIRONMENT: custom_value
           settings:
             repo: example/repo
             build_args_from_env:
-              - CUSTOM_ENVIRONMENT
+              - CI_COMMIT_SHA
       ```
     type: list
     required: false