update doc

houxiao

2017-03-03 2b853a6df6bd03d272e8a0f77879568a89b47fd6

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# ninja log v5
0    62    0    CMakeFiles/native-codec-jni.dir/looper.cpp.o    e00a432869c85363
1    315    0    CMakeFiles/native-codec-jni.dir/native-codec-jni.cpp.o    da8980b053ae1719