Remove inaccurate "zero-{copy,allocation}" claims

src/connection.hpp

@@ -70,7 +70,7 @@ struct Connection {
    * asynchronously by the server's I/O threads using efficient vectored
    * I/O.
    *
-   * @param s The data to send (string view for zero-copy efficiency)
+   * @param s The data to send (string view parameter for efficiency)
    * @param copy_to_arena If true (default), copies data to the connection's
    * arena for safe storage. If false, the caller must ensure the data remains
    * valid until all queued messages are sent.