document resetOnBlur option for Bottom Tab Navigator

[jacek213]

As discussed here: react-navigation/react-navigation#4696 (comment)

[react-navigation-bot]

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[brentvatne]

hey @jacek213! see the PR template:

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 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. website/versioned_docs/version-3.x/file-you-edited.md for version 3. If such file doesn't exist, please create it. 👍

so, this PR changes website/versioned_docs/version-3.x/file-you-edited.md but not docs/file-you-edited.md, so you'll need to change docs/file-you-edited.md as well

[jacek213]

@brentvatne sorry about that - I'm going to fix it tomorrow morning

[brentvatne]

thanks @jacek213 !

[jacek213]

@brentvatne done!

[brentvatne]

thanks!