Fixed docstrings, removed all warnings

[velle]

I fixed the doc strings that caused Unresolved Link warnings. Now runs without warnings:

cargo doc
cargo test --doc

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[meta-codesync]

@richardjrossiii has imported this pull request. If you are a Meta employee, you can view this in D84397257.

[meta-codesync]

@richardjrossiii merged this pull request in 7895d10.