[android][native-components-android.md] fix render android Fragment with flexbox

[kesha-antonov]

Hi

I was creating a library that using Android Fragment and read RN docs about it https://reactnative.dev/docs/native-components-android?android-language=java#integration-with-an-android-fragment-example

But when I opened app I faced issue that flexbox wasn't working and I could set only fixed width & height. And moreover, when I removed width/height with FastRefresh app crashed

Library here: https://github.com/kesha-antonov/react-native-trueconf-sdk

Before changes (based only on RN docs):

1.mp4

After changes (flexbox works & adding/removing width/height doesn't crash the app):

2.mp4

There's also example app: https://github.com/kesha-antonov/react-native-trueconf-sdk/tree/master/example

But you need to comment out these lines to boot it: https://github.com/kesha-antonov/react-native-trueconf-sdk/blob/master/android/build.gradle#L25-L27

And also comment out imports related to com.trueconf since access to those deps available only with credentials

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