ReleaseNotes: fix non-ASCII char, trailing spaces, and minor stuff like that

OpenMP Language Changes in Clang

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Clang 3.6 contains codegen for many individual pragmas for OpenMP but combinations are not completed as yet. 

We plan to continue codegen code drop aiming for completion for 3.7. Please see this link for up-to-date 

`status <https://github.com/clang-omp/clang/wiki/Status-of-supported-OpenMP-constructs>_`

LLVM’s OpenMP runtime library, originally developed by Intel, has been modified to work on ARM, PowerPC, 

Clang 3.6 contains codegen for many individual OpenMP pragmas, but combinations are not completed as yet.

We plan to continue codegen code drop aiming for completion in 3.7. Please see this link for up-to-date

`status <https://github.com/clang-omp/clang/wiki/Status-of-supported-OpenMP-constructs>_`.

LLVM's OpenMP runtime library, originally developed by Intel, has been modified to work on ARM, PowerPC,

as well as X86. The Runtime Library's compatibility with GCC 4.9 is improved

- missed entry points added, Barrier and fork/join code improved, one more type of barrier enabled.

- missed entry points added, barrier and fork/join code improved, one more type of barrier enabled.

Support for ppc64le architecture is now available and automatically detected when using cmake system.

Using makefile the new "ppc64le" arch type is available.

Contributors to this work include AMD, Argonne National Lab., IBM, Intel, Texas Instruments, University of Houston and many others.