ghc-ticket links appear with %s prefix in 9.4.6 and 9.6.2 documentation
On my local build they look fine in both html and pdf.
[nix-shell:~/ghc-clean]$ sphinx-build --version sphinx-build 5.3.0
in the docker image which builds the 9.4 documentation (registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10:58d08589371e78829a3279c6f8b1241e155d7f70) seems quite ancient.
ghc@f53fe83dba94:~$ sphinx-build --version sphinx-build 1.8.4
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