`/howtos/translations.html#blocks`: Typo in code example ('wainting' instead of 'waiting')

In [Blocks header](https://www.odoo.com/documentation/master/developer/howtos/translations.html#blocks), we have "wainting" instead of "waiting"
<img width="1498" height="584" alt="Image" src="https://github.com/user-attachments/assets/a66e60c8-1776-46ba-9da0-98bcb7db9509" />