We may be able to revert #2040

[gretchenfrage]

#2040 disabled building fips in docs, due to it causing an error on docs.rs build servers. However, I opened an upstream issue which justsmth claims to have solved and published in aws-lc-rs v1.11.1. This should allow us to revert #2040.

Properly testing this would require re-creating the docs.rs build environment locally. Here are their docker containers and here are their docs on self-hosting a docs.rs instance. Unfortunately, I ran into some weird problems trying to take a lazy approach of massaging their docker image into the right shape manually, and the full self-hosting instructions seem like a lot of work.