tpool: liburing typo in error

Also the ENOSYS is more likely explained by seccomp
filters in containers than a pre-5.1 kernel, so include
both.

tpool/aio_liburing.cc

@@ -52,7 +52,8 @@ class aio_uring final : public tpool::aio
       case ENOSYS:
         my_printf_error(ER_UNKNOWN_ERROR,
                         "io_uring_queue_init() failed with ENOSYS:"
-                        " try uprading the kernel",
+                        " check seccomp filters, and the kernel version "
+                        "(newer than 5.1 required)",
                         ME_ERROR_LOG | ME_WARNING);
         break;
       default: