fixed typo (#292)

Author: magnolia-k

lib/ExtUtils/MakeMaker/Tutorial.pod

@@ -125,7 +125,7 @@ Simply add another entry in the test location string. For example, to test:
 
 You would use the following C<test> directive:
 
-    test => {TESTS => 't/*.t t/*/*/*.t}
+    test => {TESTS => 't/*.t t/*/*/*.t'}
 
 Note that in the above example, tests in the first subdirectory will not be
 run. To run all tests in the intermediary subdirectory preceeding the one