Add text about test class cleanup.

llvm-svn: 117148
diff --git a/lldb/test/settings/TestSettings.py b/lldb/test/settings/TestSettings.py
index b7d39bd..9adc953 100644
--- a/lldb/test/settings/TestSettings.py
+++ b/lldb/test/settings/TestSettings.py
@@ -13,6 +13,7 @@
 
     @classmethod
     def classCleanup(cls):
+        """Cleanup the test byproducts."""
         system(["/bin/sh", "-c", "rm -f output.txt"])
         system(["/bin/sh", "-c", "rm -f stdout.txt"])