Fix various typos and spelling mistakes

Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp

@@ -676,7 +676,7 @@ void CodeViewWidget::OnContextMenu()
 
   auto* note = m_ppc_symbol_db.GetNoteFromAddr(addr);
   note_edit_action->setEnabled(note != nullptr);
-  // A note cannot be added ontop of the starting address of another note.
+  // A note cannot be added on top of the starting address of another note.
   if (note != nullptr && note->address == addr)
     note_add_action->setEnabled(false);