docs: Add [package.metadata.docs.rs] and doc_auto_cfg #350
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Problem
A few packages aren't configured properly for the docs.rs build to handle features.
Summary of changes
Add
[package.metadata.docs.rs]to Cargo.toml files that don't have it, and#![cfg_attr(docsrs, feature(doc_auto_cfg))]to lib.rs files that don't have it either.Also, add a CI step to make sure that all Cargo.toml and lib.rs files have the proper annotations.