remove incbench

Signed-off-by: He, Xin3 <xin3.he@intel.com>

Author: xin3he

docs/source/3x/benchmark.md

@@ -1,4 +1,4 @@
-Benchmark
+Benchmark (Deprecated)
 ---
 
 1. [Introduction](#introduction)
@@ -9,6 +9,8 @@ Benchmark
 
 ## Introduction
 
+> Since version >= 3.6, `incbench` has been moved.
+
 Intel Neural Compressor provides a command `incbench` to launch the Intel CPU performance benchmark.
 
 To get the peak performance on Intel Xeon CPU, we should avoid crossing NUMA node in one instance.