Clean up some random TODO(titzer)s and spelling mistakes.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index 353fa671d394c48dc82029d5b0d987543d2146b7..9624df20622786684310ae78b55e8dd11dfabe26 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -7301,7 +7301,7 @@ static void DebugEventBreakWithOptimizedStack(
         CHECK(argument_name->Equals(context, v8_str(isolate, "count"))
                   .FromJust());
         // Get the value of the first argument in frame i. If the
-        // funtion is optimized the value will be undefined, otherwise
+        // function is optimized the value will be undefined, otherwise
         // the value will be '1 - i'.
         //
         // TODO(3141533): We should be able to get the real value for