Flutter Layout Overview > Add balanced support for Material and Cupertino libraries.

[antfitch]

Description of what this PR is changing or adding, and why:

Added additional balance for Material and Cupertino instructions in the Layout overview page.

Notes:

• Added tabs in 4. Add the layout widget to the page
• In step 2, moved the focus to one visual widget that we reference in step 4.
• Added tabs in Common layout widgets
• Small updates to the intro (created an Overview heading and a Conceptual example heading).
• Small text cleanup in the overview and conceptual example section.
• Moved links into nearby sections (instead of at end)

Issues fixed by this PR (if any):

PRs or commits this PR depends on (if any):

Presubmit checklist

• This PR is marked as draft with an explanation if not meant to land until a future stable release.
• This PR doesn’t contain automatically generated corrections (Grammarly or similar).
• This PR follows the Google Developer Documentation Style Guidelines — for example, it doesn’t use i.e. or e.g., and it avoids I and we (first person).
• This PR uses semantic line breaks of 80 characters or fewer.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit de30b77):

https://flutter-docs-prod--pr11785-ios-layout-refactor-vfmtagdw.web.app

Layout overview page: https://flutter-docs-prod--pr11785-ios-layout-refactor-vfmtagdw.web.app/ui/layout

[sfshaza2]

OMG, Amanda, what a huge improvement! thx!