[DOCS] it it => it
[DOCS] it it => it

Summary: it it => it for LLVM Language Reference Manual

Reviewers: aaron.ballman, Higuoxing, liangdzou

Reviewed By: aaron.ballman, Higuoxing, liangdzou

Subscribers: Higuoxing, llvm-commits

Differential Revision: https://reviews.llvm.org/D56533

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@351517 91177308-0d34-0410-b5e6-96231b3b80d8

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