chore(docs): Custom color example should use fewer sections

[rebeccaalpert]

Two blue sections were being used. This caused a problem in high contrast mode since the sections are highlighted. This commit should adjust us down to one section, but allow us to keep the cute pyramid-in-sky effect.

Example: https://pf-react-pr-12559.surge.sh/components/charts/pie-chart#custom-color-scale

Fixes #12423

Assisted-by: Cursor

Summary by CodeRabbit

• Bug Fixes
  • Updated the custom-color pie chart example to display the correct slice values and labels.
  • Corrected pie chart angle calculations for consistent full-circle rendering.

[coderabbitai]

Walkthrough

The custom color pie chart example removes a duplicate “Sky” slice, changes its value, and derives startAngle and endAngle from pyramidStartAngle.

Changes

Pie chart example

Layer / File(s)	Summary
Update slice data and angle boundaries packages/react-charts/src/victory/components/ChartPie/examples/ChartPieCustomColorScale.tsx	The example removes the duplicate “Sky” entry, updates its y value, and sets the chart angles from pyramidStartAngle.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The example now removes the duplicated Sky slice and keeps a single blue section, matching #12423's requirement.
Out of Scope Changes check	✅ Passed	The changes stay within the pie chart example and do not introduce clearly unrelated scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and correctly reflects the main change: the custom color example now uses fewer pie sections.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12559.surge.sh

A11y report: https://pf-react-pr-12559-a11y.surge.sh