Doc link fixes

bellman/src/gadgets/uint32.rs

@@ -1,5 +1,7 @@
 //! Circuit representation of a [`u32`], with helpers for the [`sha256`]
 //! gadgets.
+//!
+//! [`sha256`]: crate::gadgets::sha256
 
 use ff::{Field, PrimeField, ScalarEngine};
 

zcash_client_backend/src/encoding.rs

@@ -2,6 +2,8 @@
 //!
 //! Human-Readable Prefixes (HRPs) for Bech32 encodings are located in the [`constants`]
 //! module.
+//!
+//! [`constants`]: crate::constants
 
 use bech32::{self, Error, FromBase32, ToBase32};
 use pairing::bls12_381::Bls12;