Merge pull request buildpacks-community#1222 from stormqueen1990/fix/update-clusterbuilder-docs

fix: remove ClusterStore from sample ClusterBuilder

Author: tomkennedy513

docs/builders.md

@@ -98,9 +98,7 @@ spec:
     - name: sample-cluster-buildpack
       kind: ClusterBuildpack
       id: paketo-buildpacks/nodejs
-    - name: sample-cluster-store
-      kind: ClusterStore
-      id: paketo-buildpacks/nodejs
+    - id: paketo-buildpacks/nodejs # can obtain buildpacks from a Store/ClusterStore
       version: 1.2.3
 ```