[HIP][doc] Update docs due to moving of HIPIFY to a separate repo (#2001)

[ROCm/hip commit: ff8d193b7f]

projects/hip/samples/2_Cookbook/0_MatrixTranspose/Readme.md

@@ -96,6 +96,6 @@ Use hipcc to build the application, which is using hcc on AMD and nvcc on nvidia
 - [HIP Runtime API (Doxygen)](http://rocm-developer-tools.github.io/HIP)
 - [HIP Porting Guide](https://github.com/ROCm-Developer-Tools/HIP/blob/master/docs/markdown/hip_porting_guide.md)
 - [HIP Terminology](https://github.com/ROCm-Developer-Tools/HIP/blob/master/docs/markdown/hip_terms.md) (including Rosetta Stone of GPU computing terms across CUDA/HIP/HC/AMP/OpenL)
-- [HIPIFY](https://github.com/ROCm-Developer-Tools/HIP/blob/master/hipify-clang/README.md)
+- [HIPIFY](https://github.com/ROCm-Developer-Tools/HIPIFY/blob/master/README.md)
 - [Developer/CONTRIBUTING Info](https://github.com/ROCm-Developer-Tools/HIP/blob/master/CONTRIBUTING.md)
 - [Release Notes](https://github.com/ROCm-Developer-Tools/HIP/blob/master/RELEASE.md)