Documentation/memory-barriers.txt: various fixes
Documentation/memory-barriers.txt: various fixes

Fix various grammatical issues in Documentation/memory-barriers.txt.

Cc: "Robert P. J. Day" <01aa5cd9a29907856ec6ddeebcb643ede4c45b8b@mindspring.com>
Signed-off-by: Jarek Poplawski <85e4e0cd35fdfcbe234be29b330d591ff9717625@o2.pl>
Signed-off-by: David Howells <ebac1d06c1688626821bb0e574a037a7a5354e49@redhat.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas