Update material-bottom-tab-navigator.md

[Ripplz]

The theme prop doesn't have any effect on this component's tab bar label font as it does react-native-paper's BottomNavigation component, so after digging through the source code, I found that you can pass a fully customized React component as this prop instead of just a string.

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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[satya164]

What do you mean by "The theme prop doesn't have any effect on this component's tab bar label font as it does react-native-paper's BottomNavigation component"?

[satya164]

Thanks for the PR, however, the types don't allow to pass anything other than a string. While passing a react element works right now it's not supported and can break in the future.