Returns the value in top-level `#+TITLE` Multiple `#+TITLE` are joined with spaces. Returns `None` if file doesn't contain `#+TITLE` ```rust use orgize::{Org, ast::Document}; let org = Org::parse("#+TITLE: hello\n#+TITLE: world"); let doc = org.first_node:: ().unwrap(); assert_eq!(doc.title().unwrap(), "hello world"); let org = Org::parse(""); let doc = org.first_node:: ().u
(&self)
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