XMRChat: add tipxmr funding note
add funding source note, as has been done for v1docq47 @ https://ccs.getmonero.org/proposals/v1docq47-monerotopia-2024-voiceovers-and-working-on-xmr.ru.html
add funding source note, as has been done for v1docq47 @ https://ccs.getmonero.org/proposals/v1docq47-monerotopia-2024-voiceovers-and-working-on-xmr.ru.html