docs: update `full-text-search.md` (#447)

Ben Schlegel

2023-09-04 6ef4246cf186414d1b8ee868cfa9d24314f0bc0a

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