Fix example claims to use valid rectangular plots

[ethan-yi-dev]

What was changed

The example in step 4 has been updated to use valid rectangular plots that are consistent with the exercise description.

Why

The exercise guarantees that plot coordinates always form a contiguous rectangular shape.
The original example violated this guarantee, and a minimal correction would also result in overlapping claims, which can be confusing in a teaching example.

This update:

• ensures both example claims are valid rectangles, and
• keeps the claims non-overlapping while preserving the original intent of demonstrating the plot with the longest side.

[github-actions]

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[ethan-yi-dev]

Forum discussion opened here:
https://forum.exercism.org/t/fix-example-claims-to-use-valid-rectangular-plots-in-land-grab-in-space/20344