Update GettingStarted.md

[onstash]

react-native start is missing in the document.

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Motivation (required)

I was stuck with issue #9336. One of the suggestions / solutions in the issue was to run react-native start. That solved the issue for me. But that is missing in GettingStarted.md.

What existing problem does the pull request solve?

Prevents users from facing issue #9336 .

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[hramos]

It sounds like running react-native start is just one of various suggested workarounds for the issue you linked, which has yet to be resolved. Wouldn't it be best to fix whatever issue prevents the CLI from starting the packager automatically?

[onstash]

@hramos Hi there. Sorry for the delayed response. Your suggestion seems valid but I just started learning React Native, recently. Is it possible to help / mentor me for pushing the suggested fix?