add a comment about NODE_ENV value set to 'production' during build step (#1625)
add a comment about NODE_ENV value set to 'production' during build step (#1625)

* add a comment about NODE_ENV value set to 'production' during build step

https://github.com/facebookincubator/create-react-app/issues/790#issuecomment-281986264

* Move words around

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