[Doc][LangRef] Fix typo-ish error in description of Masked Gather

Summary: Fix the example of equivalent expansion for when mask is all ones.

Reviewers: delena

Reviewed By: delena

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29179

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293206 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Zvi Rackover

docs/LangRef.rst

@@ -11831,7 +11831,7 @@ The semantics of this operation are equivalent to a sequence of conditional scal
 
 ::
 
-       %res = call <4 x double> @llvm.masked.gather.v4f64 (<4 x double*> %ptrs, i32 8, <4 x i1>%mask, <4 x double> <true, true, true, true>)
+       %res = call <4 x double> @llvm.masked.gather.v4f64 (<4 x double*> %ptrs, i32 8, <4 x i1> <i1 true, i1 true, i1 true, i1 true>, <4 x double> undef)
 
        ;; The gather with all-true mask is equivalent to the following instruction sequence
        %ptr0 = extractelement <4 x double*> %ptrs, i32 0