[lldb] Remove obsolete comment in TestCortexMExceptionUnwind

(cherry picked from commit 8706ef4)

Author: jasonmolenda

lldb/test/API/functionalities/unwind/cortex-m-exception/TestCortexMExceptionUnwind.py

@@ -39,10 +39,6 @@ def test_no_fpu(self):
         thread = process.GetThreadAtIndex(0)
         self.assertTrue(thread.IsValid())
 
-        # We have 4 named stack frames and two unnamed
-        # frames above that.  The topmost two stack frames
-        # were not interesting for this test, so I didn't
-        # create symbols for them.
         self.assertEqual(thread.GetNumFrames(), 3)
         stackframe_names = [
             "exception_catcher",