Update consumer examples for document-root controls

examples/consumers/testdata/sequence-catalog/config.yml

@@ -1,5 +1,5 @@
 run_label: source-default
-configkit:
+config:
   imports:
     - dir: fragments
       pattern: '*.yml'

examples/consumers/testdata/sequence-catalog/overlays/append.yml

@@ -1,4 +1,4 @@
-configkit:
+config:
   sequences:
     - destination: [prompts]
       key: id

examples/consumers/testdata/sequence-catalog/overlays/replace.yml

@@ -1,4 +1,4 @@
-configkit:
+config:
   sequences:
     - destination: [prompts]
       key: id

examples/consumers/testdata/sequence-catalog/overlays/upsert.yml

@@ -1,4 +1,4 @@
-configkit:
+config:
   sequences:
     - destination: [prompts]
       key: id

examples/consumers/testdata/sequence-catalog/underlay.yml

@@ -1,4 +1,4 @@
-configkit:
+config:
   sequences:
     - destination: [prompts]
       key: id