Description

This PR adds 2 code snippets for the FloatingActionButton class in the API docs. The first is a simple case, the second illustrates the use of the extended FAB constructor.

For your consideration dear reviewer...
I used the stateless widget template, and left the onPressed properties empty in these samples to focus on a simple example of constructing the FAB widget.
If changing this template to a stateful widget and implementing the popular counter example (or something similar) would be better to further exemplify this widget, share your thoughts below and I can modify it!

Related Issues

Ref: #21136

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes tests for all changed/updated/fixed behaviors (See Test Coverage).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require Flutter developers to manually update their apps to accommodate your change?

• Yes, this is a breaking change (Please read Handling breaking changes).
• No, this is not a breaking change.