docs(explorer): Fixed small typo with extra } in explorer.md (#541)

Thomas

2023-10-18 86d16b12a224d125ba469f91e885eedf97a9dfe8

 quartz/components/Header.tsx

@@ -9,7 +9,7 @@
  display: flex;
  flex-direction: row;
  align-items: center;
  margin: 2em 0;
  margin: 2rem 0;
  gap: 1.5rem;
}