update chinese doc

docs/documention-cn.md

@@ -30,8 +30,6 @@
 - `srt`: Secure Reliable Transport
 - `webp`: Image format both lossless and lossy
 
-## some spec has using some flag with the repo's recommended params spec.
-
 ## 一些我们使用的ffmpeg参数也参考了下面的方法：
 
 [https://gist.github.com/mikoim/27e4e0dc64e384adbcb91ff10a2d3678](https://gist.github.com/mikoim/27e4e0dc64e384adbcb91ff10a2d3678)