Function get_dbi_method_documentation 

pub fn get_dbi_method_documentation(
    receiver_hint: &str,
    method_name: &str,
) -> Option<(&'static str, &'static str)>

Look up DBI method documentation by receiver hint and method name.

receiver_hint is the variable name or token before -> (e.g. "$dbh", "$sth"). Returns (signature, description) or None if not a known DBI method.

When the receiver is ambiguous, database-handle methods take priority.