docs: Match TextInput.Affix screenshot with code example

[hugs7]

Motivation

The current documentation page for TextInput.Affix is a little confusing as the screenshot does not match the code example. This change ensures the screenshot from TextInput.Affix matches the code example below it.

Related issue

Fixes #4529 raised by me.

Test plan

Please see code differences to see change to the screenshot. Should be trivial to review - no code testing required.

[callstack-bot]

Hey @hugs7, thank you for your pull request 🤗. The documentation from this branch can be viewed here.