fix doc link in setclientcert

Author: chronolaw

README.markdown

@@ -3608,7 +3608,7 @@ Nginx API for Lua
 * [ngx.socket.stream](#ngxsocketstream)
 * [ngx.socket.tcp](#ngxsockettcp)
 * [tcpsock:connect](#tcpsockconnect)
-* [tcpsock:setclientcert](tcpsocksetclientcert)
+* [tcpsock:setclientcert](#tcpsocksetclientcert)
 * [tcpsock:sslhandshake](#tcpsocksslhandshake)
 * [tcpsock:send](#tcpsocksend)
 * [tcpsock:receive](#tcpsockreceive)
@@ -7579,7 +7579,7 @@ ngx.socket.tcp
 Creates and returns a TCP or stream-oriented unix domain socket object (also known as one type of the "cosocket" objects). The following methods are supported on this object:
 
 * [connect](#tcpsockconnect)
-* [setclientcert](tcpsocksetclientcert)
+* [setclientcert](#tcpsocksetclientcert)
 * [sslhandshake](#tcpsocksslhandshake)
 * [send](#tcpsocksend)
 * [receive](#tcpsockreceive)