message: Explain `Comments::parse` arguments
diff: @@ -39,6 +39,8 @@ impl Comments {
  Self::parse(path, &content)
  }
  + /// Parse comments in `content`.
  + /// `path` is only used to emit diagnostics if parsing fails.
  pub fn parse(path: &Path, content: &str) -> Self {
  let mut this = Self::default();
  let error_pattern_regex =
  