message: librustzcash crate doc
diff: +//! FFI between the C++ zcashd codebase and the Rust Zcash crates.
  +//!
  +//! This is internal to zcashd and is not an officially-supported API.
  +
  // Catch documentation errors caused by code changes.
  #![deny(intra_doc_link_resolution_failure)]
  // Clippy has a default-deny lint to prevent dereferencing raw pointer arguments
  