Update comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192804 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/arm_neon.td b/include/clang/Basic/arm_neon.td
index 06fb9a3..c65a99b 100644
--- a/include/clang/Basic/arm_neon.td
+++ b/include/clang/Basic/arm_neon.td
@@ -868,6 +868,6 @@
 def SCALAR_SUQADD : SInst<"vuqadd", "sss", "ScSsSiSl">;
 
 ////////////////////////////////////////////////////////////////////////////////
-// Scalar Unsigned Saturating Accumulated of Unsigned Value
+// Scalar Unsigned Saturating Accumulated of Signed Value
 def SCALAR_USQADD : SInst<"vsqadd", "sss", "SUcSUsSUiSUl">;
 }