docs: add ascii-art to lws_write description
docs: add ascii-art to lws_write description

https://github.com/warmcat/libwebsockets/issues/736
sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets