fix: typo on document (#1355)

Jeff-Tian · fengmk2 · commit ff70bdc75a30 · 2019-07-11T15:44:52.000+08:00
diff --git a/docs/api/response.md b/docs/api/response.md
@@ -17,7 +17,7 @@
 
 ### response.socket
 
-  Request socket.
+  Response socket.
 
 ### response.status
 
