Fix a typo


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/TestingGuide.html b/docs/TestingGuide.html
index f036515..5bbb9b2 100644
--- a/docs/TestingGuide.html
+++ b/docs/TestingGuide.html
@@ -565,7 +565,7 @@
 
 <p>If you'd like to set up an instance of the nightly tester to run on your
 machine, take a look at the comments at the top of the
-<tt>utils/NightlyTester.pl</tt> file.  We usually run it from a crontab entry
+<tt>utils/NightlyTest.pl</tt> file.  We usually run it from a crontab entry
 that looks like this:</p>
 
 <div class="doc_code">