fix example

Signed-off-by: razzle <[email protected]>

examples/component-choice/zarf.yaml

@@ -5,12 +5,16 @@ metadata:
 
 components:
   - name: first-choice
+    # if using a group, all members of the group must be optional
+    optional: true
     group: example-choice
     files:
       - source: blank-file.txt
         target: first-choice-file.txt
 
   - name: second-choice
+    # if using a group, all members of the group must be optional
+    optional: true
     group: example-choice
     default: true
     files: