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

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7283 matching lines @@
             function_name->Equals(context, v8_str(isolate, "loop")).FromJust());
         // Get the name of the first argument in frame i.
         result = frame_argument_name->Call(context, exec_state, argc, argv)
                      .ToLocalChecked();
         CHECK(result->IsString());
         v8::Local<v8::String> argument_name(
             result->ToString(context).ToLocalChecked());
         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
         // optimized frames.
         result = frame_argument_value->Call(context, exec_state, argc, argv)
                      .ToLocalChecked();
         CHECK(result->IsUndefined() ||
               (result->Int32Value(context).FromJust() == 1 - i));
         // Get the name of the first local variable.
         result = frame_local_name->Call(context, exec_state, argc, argv)
@@ skipping 734 matching lines @@
   CHECK_EQ(22, iterator->GetBreakLocation().position());
   iterator->Next();
   CHECK(iterator->GetBreakLocation().IsReturn());
   CHECK_EQ(50, iterator->GetBreakLocation().position());
   iterator->Next();
   CHECK(iterator->Done());
   delete iterator;
 
   DisableDebugger(isolate);
 }