Fix Moore docs after !3812 - dont use Indico anchor

Verified that this fixes the Moore doc build locally. My bad for not explicitly testing this when I made !3812 (merged) - I didn't realise the Sphinx builder was so fragile!

added Documentation label

assigned to @rjhunter

assigned to @cagapopo

added RTA label

Hello @cagapopo, I'm working on the docs in Moore and I came across this error, and I could fix it locally with this. Is there any more testing I can do? If not I'd be happy for you to merge it, thanks.

mentioned in merge request Moore!3224 (merged)

merged

mentioned in commit 6da2a527

resolved all threads

changed the description

mentioned in issue Moore#730 (closed)