Re-apply TestHelp.py fix



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@185570 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/help/TestHelp.py b/test/help/TestHelp.py
index 5dfc1ff..54d10ba 100644
--- a/test/help/TestHelp.py
+++ b/test/help/TestHelp.py
@@ -124,7 +124,7 @@
         """Command 'help image du line' is not ambiguous and should work."""
         # 'image' is an alias for 'target modules'.
         self.expect("help image du line",
-            substrs = ['Dump the debug symbol file for one or more target modules'])
+            substrs = ['Dump the line table for one or more compilation units'])
 
     def test_help_target_variable_syntax(self):
         """Command 'help target variable' should display <variable-name> ..."""