Fix various typos

Conflicts:
	README.md

Change-Id: Ie296d503d16121a62fed1a208352ec2b81c97fd9

docs/markdown/hip_porting_guide.md

@@ -1,5 +1,5 @@
 # HIP Porting Guide 
-In addition to providing a portable C++ programmming environement for GPUs, HIP is designed to ease
+In addition to providing a portable C++ programming environment for GPUs, HIP is designed to ease
 the porting of existing CUDA code into the HIP environment.  This section describes the available tools 
 and provides practical suggestions on how to port CUDA code and work through common issues.