document how FLUTTER_BUILD_MODE is set during asset transformation
#11510
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Documents the feature long-ago implemented by flutter/flutter#144958.
Summary: this documents that asset-transforming Dart packages can read
FLUTTER_BUILD_MODEfrom the environment to determine what mode the app is being built in. This also tries to fix what I think was a typo in the original docs.If you are curious about what asset transformation is, read Assets and Images (flutter.dev) to learn how to bundle assets (arbitrary files, such as images) into your app and then read Asset transformation (flutter.dev).
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