Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 stdio_language_connector(Arg1)

 with_stdio_language(Arg1, Arg2)

 with_tcp_language(Arg1, Arg2, Arg3)

 initialize(Arg1, Arg2)

 initialized(Arg1)

 shutdown(Arg1, Arg2)

 exit(Arg1)

 jsonrpc_connect(Arg1, Arg2)

 jsonrpc_disconnect(Arg1)

 with_connection(Arg1, Arg2, Arg3)

 call_method(Arg1, Arg2, Arg3)

 call_method(Arg1, Arg2, Arg3, Arg4)

 notify_method(Arg1, Arg2, Arg3)

 expect_error(Arg1, Arg2)