Fix a speling error.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71791 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 514f947..5fefa2d 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -317,7 +317,7 @@
   "%0 to base class %1:%2)">;
 def err_covariant_return_not_derived : Error<
   "return type of virtual function %0 is not covariant with the return type of "
-  "the function it overrrides (%1 is not derived from %2)">;
+  "the function it overrides (%1 is not derived from %2)">;
 def err_covariant_return_type_different_qualifications : Error<
   "return type of virtual function %0 is not covariant with the return type of "
   "the function it overrides (%1 has different qualifiers than %2)">;