docs: mention Settings would be the route an app would be displaying for listed JS state

[rctay]

READ ME PLEASE!

TL;DR: Make sure to add your changes to versioned docs

Thanks for opening a PR!

The docs cover several versions of react-navigation, and in some cases there are several files (for version 1, version 2 and etc.) that all describe a single page of the docs (eg. "Getting Started").

Please make sure that the edit you're making in docs/file-you-edited.md is also included in the file for the correct version, eg. /versioned_docs/version-3.x/file-you-edited.md for version 3. If such file doesn't exist, please create it. :+1:

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Hi there, this change further fleshes out which route is displayed by an app that would correspond to the navigation state represented by the listed JavaScript object. For example, it might not be immediately obvious to a newcomer that among the 2 routes of Home and Settings, it would be Settings that is displayed, and not Home.

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