Update modal.md
The example shown in the documentation was wrong. The parent stack navigator needs to have its headerMode prop set to none. The headerShown option is irrelevant for this example.
READ ME PLEASE!
TL;DR: Make sure to add your changes to versioned docs
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Why is it wrong? The example demonstrates that you have to hide the header only for the screen containing a nested stack. The other screen can still have a header.
I thought this was about opening an full-screen modal, without any header, when navigating to the screen that says "This is a modal", just as it is shown in the gif at the top of the page.
https://reactnavigation.org/assets/images/modal-demo-c21e394139257ff16390d46aa6ba5bc2.gif
I'm only able to accomplish that by setting headerMode="none".
The GIF needs to be updated. The examples are written this way intentionally. So I'm closing this PR.