Add more details for fragmentation

docs/config/outbounds/freedom.md

@@ -52,7 +52,7 @@ userLevel 的值, 对应 [policy](../policy.md#policyobject) 中 `level` 的值
 
 一些键值对配置项，用于控制发出的 TCP 分片，在某些情况下可以欺骗审查系统，比如绕过 SNI 黑名单。
 
-`"packets"`：支持两种分片方式 "1-3" 是 TCP 的流切片，"tlshello" 是 TLS 握手包切片
+`"packets"`：支持两种分片方式 "1-3" 是 TCP 的流切片，应用于客户端第 1 至第 3 次写数据。"tlshello" 是 TLS 握手包切片。
 
 `"length"`：分片包长
 

docs/en/config/outbounds/freedom.md

@@ -50,7 +50,7 @@ The value of `userLevel` corresponds to the value of `level` in the [policy](../
 
 A key-value map used to control TCP fragmentation，under some circumstances it can cheat the censor syetem, like bypass a SNI blacklist.
 
-`"packets"`：support two different methods. "1-3" is for segmentation at TCP layer, "tlshello" is for TLS client hello packet fragmentation
+`"packets"`：support two different methods. "1-3" is for segmentation at TCP layer, applying to the beginning 1 to 3 data writes by the client. "tlshello" is for TLS client hello packet fragmentation.
 
 `"length"`: length to make the cut