docs: added permalink description to supported frontmatter doc (#1369)

Elijah Kennedy

2024-08-24 647c12552569201dc1cf8c9b4f2ebb17fa2c1169

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.content-meta {
  margin-top: 0;
  color: var(--gray);
 
  &[show-comma="true"] {
    > span:not(:last-child) {
      margin-right: 8px;
 
      &::after {
        content: ",";
      }
    }
  }
}