chore(apigateway): fix the readme sections order.

[moelasmar]

Description of changes

Fixes the readme sections order to match the original order when Breaking up Methods and Resources across Stacks section was originally added in this PR #8270. The current order does not make sense, this section does not related to the Step function backed rest API

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.54%. Comparing base (491475a) to head (fdc14dd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32650   +/-   ##
=======================================
  Coverage   80.54%   80.54%           
=======================================
  Files         106      106           
  Lines        6954     6954           
  Branches     1287     1287           
=======================================
  Hits         5601     5601           
  Misses       1175     1175           
  Partials      178      178           

Flag	Coverage Δ
suite.unit	80.54% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	80.54% <ø> (ø)

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: fdc14dd
• Result: SUCCEEDED
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