Fix step name

Author: nkammah

.buildkite/build_pr_pipeline.yml

@@ -1,8 +1,9 @@
 steps:
   - key: "build-pr-setup"
+    label: "setup"
     command: .buildkite/scripts/build_pr_setup.sh
   - key: "build-pr"
-    label: "Build docs PR"
+    label: ":hammer: Build docs PR"
     command: |
       bash .buildkite/scripts/build_pr.sh
     depends_on:
@@ -12,6 +13,7 @@ steps:
       provider: "gcp"
       image: family/docs-ubuntu-2204
   - command: .buildkite/scripts/build_pr_teardown.sh
+    label: "teardown"
     depends_on:
-      - step: "build"
+      - step: "build-pr"
         allow_failure: true