Update README.md

Author: jeng1220

access_efficiency/README.md

@@ -2,4 +2,4 @@
 * [How to Access Global Memory Efficiently in CUDA Fortran Kernels](https://developer.nvidia.com/blog/how-access-global-memory-efficiently-cuda-fortran-kernels/)
 
 C/C++ version:
-* [How to Access Global Memory Efficiently in CUDA C/C++ Kernels](https://developer.nvidia.com/blog/how-implement-performance-metrics-cuda-cc/)
+* [How to Access Global Memory Efficiently in CUDA C/C++ Kernels](https://developer.nvidia.com/blog/how-access-global-memory-efficiently-cuda-c-kernels/)