corrected typo in robust speech event README.md regarding OVH Cloud link
# What does this PR do?
Corrects a typo in robust speech event README that incorrectly directed US users to the Canadian OVH Cloud site.

## Before submitting
- [X] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).

## Who can review?
@patrickvonplaten @anton-l 

_The documentation is not available anymore as the PR was closed or merged._<|||||>US OVHcloud service is sadly not supported by this event