Fixed typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141906 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index cedd024..3aad800 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -2580,7 +2580,7 @@
 </ul>
 
 <p>Whenever a trap value is generated, all values which depend on it evaluate
-   to trap. If they have side effects, the evoke their side effects as if each
+   to trap. If they have side effects, they evoke their side effects as if each
    operand with a trap value were undef. If they have externally-visible side
    effects, the behavior is undefined.</p>