Fix broken links for User Guide · MDAnalysis/UserGuide@8211596

Canceling since a higher priority waiting request for 'refs/pull/394/merge-broken-link-mda_gh_ci' exists

The operation was canceled.

Failed to save: Unable to reserve cache with key downloads-2024-10-21-linux-64, another job may be creating this cache. More details: Cache already exists. Scope: refs/pull/394/merge, Key: downloads-2024-10-21-linux-64, Version: fd589871226f2427db40904ab3f139f6e9fe542d5228eeb2a790fd83584854df