Function describe_symbol_cross_file 

pub fn describe_symbol_cross_file(
    files: &HashMap<PathBuf, String>,
    current_path: &Path,
    name: &str,
) -> Option<(PathBuf, String)>

Markdown hover content for name from any project file other than current_path, plus the path of the file that contributed it. See find_declaration_cross_file’s doc for the content-ownership-track shape of files. Returns None if the name is not declared anywhere in the project.