docs(charts): document how to remove Antarctica from maps

[Anexus5919]

Description

Closes #22810.

The Map docs already mention that the projection auto-fits to the geoData bounds, but there was no example of how changing geoData affects that fit. This adds a short section and an interactive demo that show how to omit Antarctica, which is a common need since most datasets have nothing to render there.

What changed

• New section "Filtering the geographic data" in docs/data/charts/map/map.md, placed right after "Modifying the projection".
• New demo RemoveAntarctica.tsx (plus the generated .js) with an "Include Antarctica" toggle.

Why this shows the projection impact

The provider fits the projection to the bounding box of whatever features are in geoData (through fitExtent, when no explicit scale is set). Antarctica reaches the bottom of most projections, so including it forces the fit to reserve vertical space that is usually empty, which shrinks every other landmass. Filtering it out lets the populated regions fill the drawing area. Toggling the checkbox makes that refit visible.

The example filters by feature name, matching how series already join to features (feature.properties.name):

const countriesWithoutAntarctica = {
  ...countries,
  features: countries.features.filter(
    (feature) => feature.properties?.name !== 'Antarctica',
  ),
};

Validation

• eslint on both demo files: clean
• vale on map.md: no errors, warnings, or suggestions
• tsc -p docs/tsconfig.json: clean
• .js generated through the standard babel and prettier pipeline so it stays in sync with the .tsx

Notes

• Docs only. No source or API changes, and no new translation keys.

• The Map is a Premium preview feature, so the demo shows the usual missing-license watermark in local dev without a license key. It does not appear on the published docs.

• I have followed (at least) the PR section of the contributing guide.

Preview: https://deploy-preview-22818--material-ui-x.netlify.app/x/react-charts/map/#filtering-the-geographic-data

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[Anexus5919]

@rita-codes @alexfauquette Kindly have a review on this pr. Thanks!

[code-infra-dashboard]

Deploy preview

• docs/data/charts/map/map.md

Bundle size

Bundle	Parsed size	Gzip size
@mui/x-data-grid	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-pro	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-premium	0B(0.00%)	0B(0.00%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-charts-premium	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)
@mui/x-license	0B(0.00%)	0B(0.00%)

Details of bundle changes

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[alexfauquette]

Closing since it's duplicated with #22815

and the docs example does not seems to impact the projection contrary to what is said in the PR description