Update screenshot for align widget example on 'Layouts in Flutter' page

[fodil-a]

Page URL: https://docs.flutter.dev/ui/layout#aligning-widgets Page source: https://github.com/flutter/website/tree/master/src/docs/development/ui/layout/index.md

Found a typo? You can fix it yourself by going to the page source and clicking the pencil icon. Or finish creating this issue.

Description of issue: the image of row_column example for Column align is wrong
It shows:

Instead of showing something like:

The errors are:

1. The images are not the same as in the repository here
2. The image does not show the specificity of MainAxisAlignment.spaceEvenly, which is to space evenly better, BEFORE and AFTER.