Consider enabling the OpenSSL feature when publishing to docs.rs

[LtdJorge]

Give a detailed description of the feature request
Right now, documentation for types like X509Certificate doesn't exist, because those types are gated behind the openssl feature, and Docs.rs only uses default features unless custom metadata is added.

This also messes with type inference and/or rust-analyzer, like so (Rustrover):

Additional context
Docs.rs provides complete documentation on the topic here. For a real-life example, take the Cargo.toml from Tokio.