Examples: Minor code changes to address warnings.

2 examples were triggering: ```Each child in an array should have a unique "key" prop. Check the render method of App. See http://fb.me/react-warning-keys for more information.```

1 example was triggering: ```Warning: PreDashboard is calling a React component directly. Use a factory or JSX instead. See: http://fb.me/react-legacyfactory```