Returns parsed description Returns empty iterator if this link doesn't contain description ```rust use orgize::{Org, ast::Link, SyntaxKind}; let link = Org::parse("[[https://google.com]]").first_node:: ().unwrap(); assert_eq!(link.description().count(), 0); let link = Org::parse("[[https://google.com][Google]]").first_node:: ().unwrap(); let description = link.description().collect::
(&self)
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