docs: fix typo in `authoring content.md` (#408)

Ben Schlegel

2023-08-24 9d2340e90b55fb9480e0901bc7360f3d72e688da

 quartz/components/styles/popover.scss

@@ -43,7 +43,9 @@

  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease;

  @media all and (max-width: $mobileBreakpoint) {
    display: none !important;