Fix typo

Differential Revision: http://reviews.llvm.org/D3237

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205673 91177308-0d34-0410-b5e6-96231b3b80d8

utils/yaml-bench/YAMLBench.cpp

@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This program executes the YAMLParser on differntly sized YAML texts and
+// This program executes the YAMLParser on differently sized YAML texts and
 // outputs the run time.
 //
 //===----------------------------------------------------------------------===//