[DOXYGEN] Fix doxygen and content issues in pmmintrin.h
[DOXYGEN] Fix doxygen and content issues in pmmintrin.h

- Fix incorrect wording in various intrinsic descriptions. Previously the descriptions used "low-order" and "high-order" when the intended meaning was "even-indexed" and "odd-indexed".

This patch was made by Craig Flores

Differential Revision: https://reviews.llvm.org/D41518


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@321670 91177308-0d34-0410-b5e6-96231b3b80d8

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