docs: fix property name for ToC toggle (#573)

Niklas Schröder

2023-11-07 2a6b9a9ea01e8e6a80fe51d01dc865595b67a612

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 380px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;