Update about-config.md

docs/en/about-config.md

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 Most of the parameters are self-explanatory. Note: the ttl and related parameters in DNS configuration are in **seconds**. The timeout for endpoint is in **milliseconds**, and -1 indicates an infinite timeout.   
-dns\_threads indicates the total number of threads accessing DNS in parallel, but by default, we use asynchronous DNS resolving and don't create any dns threads.  
+dns\_threads indicates the total number of threads accessing DNS in parallel, but by default, we use asynchronous DNS resolving and don't create any dns threads (Except windows platform).  
 dns\_server\_params indicates parameters that we access DNS server, including the maximum cocurrent connections, and the DNS server's connecting and response timeout.  
 compute\_threads indicates the number of threads used for computation. The default value is -1, meaning the number of threads is the same as the number of CPU cores in the current node.   
+resolv\_conf\_path indicate the path of dns resolving configuration file. The default value is "/etc/resolv.conf" on unix platforms and NULL on windows. On the windows platform, we still use multi-threaded dns resolving by default.  
+hosts_path indicates the path of the **hosts** file. The default value is "/etc/hosts" on unix platforms. If resolv_conf_path is NULL, this configuration will be ignored.  
 poller\_threads and handler\_threads are the two parameters for tuning network performance:
 
 * poller\_threads is mainly used for epoll (kqueue) and message deserialization.