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The existing documentation on this topic doesn't provide enough of detail on where to start a headlessJS task.
Just docs change
This PR extends HeadlessJS documentation to show an example on how to start HeadlessJsTaskService. Sample code in example reacts to connectivity change using custom broadcast receiver logic that bundles additional information and starts the aforementioned service.
Closes https://github.com/facebook/react-native/pull/13957
Differential Revision: D5746809
Pulled By: hramos
fbshipit-source-id: 3eeea7d4a71382acf4b6f7ad1b99d20e2745c558