docs(location): specify that Map, PlaceIndex, and RouteCalculator are now legacy in README

[mazyu36]

Issue # (if applicable)

Closes #32722.

Reason for this change

Amazon Location Service launches Enhanced Places, Routes, and Maps on Nov 8, 2024 (Ref).

New APIs for Maps, Places and Routes are launched and account-bound resources are no longer required.

Therefore, I think it’s better to mention in the README that the constructs related to these are considered legacy.

Description of changes

• Add a section for legacy resources in the README.
• Move the descriptions related to Map, PlaceIndex, and RouteCalculator to that section.

Describe any new or updated permissions being added

None

Description of how you validated changes

None

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 80.78%. Comparing base (c710e70) to head (0cdf1ff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32871   +/-   ##
=======================================
  Coverage   80.78%   80.78%           
=======================================
  Files         232      232           
  Lines       14111    14111           
  Branches     2453     2453           
=======================================
  Hits        11400    11400           
  Misses       2431     2431           
  Partials      280      280           

Flag	Coverage Δ
suite.unit	80.78% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	79.51% <ø> (ø)
packages/aws-cdk-lib/core	82.17% <ø> (ø)

[lpizzinidev]

👍 Not sure if the convention with methods in docs is to specify them with parenthesis or not

[aws-cdk-automation]

(This review is outdated)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0cdf1ff
• Result: SUCCEEDED
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