Docs: update the Overflow docs with information about forwarding ref when custom component is rendered

[george-cz]

Fixes #27652

[codesandbox-ci[bot]]

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[fabricteam]

📊 Bundle size report

✅ No changes found

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	610	620	5000
Button	mount	316	298	5000
Field	mount	1130	1106	5000
FluentProvider	mount	710	715	5000
FluentProviderWithTheme	mount	82	79	10
FluentProviderWithTheme	virtual-rerender	33	29	10
FluentProviderWithTheme	virtual-rerender-with-unmount	78	81	10
MakeStyles	mount	857	850	50000
Persona	mount	1729	1658	5000
SpinButton	mount	1404	1419	5000
SwatchPicker	mount	1535	1530	5000

[fabricteam]

🕵 fluentuiv9 No visual regressions between this PR and main