Add example in FlatButton, RaisedButton, etc that shows setting the text of the button

[sethladd]

I checked the FlatButton and I couldn't find the simple of example of "a button with text". There isn't an obvious "declare the text of the button here". I assume it's the child widget?

https://docs.flutter.io/flutter/material/FlatButton-class.html

It would be sufficient, IMO, to show a simple example snippet in the top of the docs.

[sethladd]

cc @Hixie

[edutrul]

I agree!
for instance here's a piece of code to update in documentation

new RaisedButton(
  child: new Text('Play!'),
  color: Colors.blueAccent,
),

[Hixie]

Yeah we should add sample code and screen shots to those API docs.

[github-actions]

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