From 1f425a0244bcd7b4565dceb9076450d951f2ec03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rust=E5=A4=A7=E9=97=B8=E8=9F=B9?= <liaoymxsdl@gmail.com>
Date: Thu, 31 Dec 2020 04:05:01 +0800
Subject: [PATCH] example: update usage doc for blocking example (#1112)