supervisord.conf配置文件修正

将126行supervisor.sock修改为supervisord.sock，和138行相匹配。

Author: haibinpark

ebook/12.3.md

@@ -123,7 +123,7 @@ Supervisord默认的配置文件路径为/etc/supervisord.conf，通过文本编
 
 	;/etc/supervisord.conf
 	[unix_http_server]
-	file = /var/run/supervisor.sock
+	file = /var/run/supervisord.sock
 	chmod = 0777
 	chown= root:root