pytorch

2ac09cc6 - changed install_katex.sh to install_docs_reqs.sh, added install doxygen (#77907)

changed install_katex.sh to install_docs_reqs.sh, added install doxygen (#77907) Fixes #77399 Increase CI stability by migrating a dependency to Docker to minimize risk of failure in installation. Installing doxygen in install_docs_reqs.sh instead of the cpp docs script. **Test Plan**: cpp docs build passes Pull Request resolved: https://github.com/pytorch/pytorch/pull/77907 Approved by: https://github.com/seemethere, https://github.com/janeyx99