docs: update expo start command to run example project #4474
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Motivation
This pull request adds the updated command to run expo, so that the "owner" field on app.json doesn't affect the app.
It prevents getting the following error
Related issue
This pull request, addresses this issue #4473
Test plan
Previously when trying to run the example project using
yarn example run
on root project orexpo start
in example folder it would give the error mentioned above.With the using new command
npx expo start --offline
( which is added with this pull requests on docs), the example project runs without any issue.