Correct logical shift documentation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181290 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index 410f640..4d006f1 100644
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -4008,7 +4008,7 @@
       <result> = lshr i32 4, 1   ; yields {i32}:result = 2
       <result> = lshr i32 4, 2   ; yields {i32}:result = 1
       <result> = lshr i8  4, 3   ; yields {i8}:result = 0
-      <result> = lshr i8 -2, 1   ; yields {i8}:result = 0x7FFFFFFF
+      <result> = lshr i8 -2, 1   ; yields {i8}:result = 0x7F
       <result> = lshr i32 1, 32  ; undefined
       <result> = lshr <2 x i32> < i32 -2, i32 4>, < i32 1, i32 2>   ; yields: result=<2 x i32> < i32 0x7FFFFFFF, i32 1>