Doc update.

- Add link to new driver porting guide.
- small typo

Change-Id: Ia8e25e371e17f8b4207b99e3fdfb575e59c2ebf2

README.md

@@ -31,6 +31,7 @@ HIP releases are typically of two types. The tag naming convention is different
 - [HIP Kernel Language](docs/markdown/hip_kernel_language.md)
 - [HIP Runtime API (Doxygen)](http://gpuopen-professionalcompute-tools.github.io/HIP)
 - [HIP Porting Guide](docs/markdown/hip_porting_guide.md)
+- [HIP Porting Driver Guide](docs/markdown/hip_porting_driver_api.md)
 - [HIP Terminology](docs/markdown/hip_terms.md) (including Rosetta Stone of GPU computing terms across CUDA/HIP/HC/AMP/OpenL)
 - [clang-hipify](clang-hipify/README.md)
 - [Developer/CONTRIBUTING Info](CONTRIBUTING.md)

cmake/FindHIP.cmake

@@ -179,7 +179,7 @@ hip_find_helper_file(run_hipcc cmake)
 ###############################################################################
 
 ###############################################################################
-# MACRO: Seperate the options from the sources
+# MACRO: Separate the options from the sources
 ###############################################################################
 macro(HIP_GET_SOURCES_AND_OPTIONS _sources _cmake_options _hipcc_options _hcc_options _nvcc_options)
     set(${_sources})