Update docs

Signed-off-by: Denis Varlakov <[email protected]>

udigest/src/as_.rs

@@ -2,13 +2,13 @@
 //!
 //! It's supposed to be used in a pair with derive proc macro and `as` attribute.
 //! For instance, it can be used to digest a hash map "as a btree map":
-//!   ```rust
-//!   #[derive(udigest::Digestable)]
-//!   pub struct Attributes(
-//!       #[udigest(as = std::collections::BTreeMap<_, udigest::Bytes>)]
-//!       std::collections::HashMap<String, Vec<u8>>,
-//!   );
-//!   ```
+//! ```rust
+//! #[derive(udigest::Digestable)]
+//! pub struct Attributes(
+//!     #[udigest(as = std::collections::BTreeMap<_, udigest::Bytes>)]
+//!     std::collections::HashMap<String, Vec<u8>>,
+//! );
+//! ```
 //!
 //! See more examples in [macro@Digestable] macro docs.
 

udigest/src/lib.rs

@@ -202,7 +202,9 @@ pub use encoding::Buffer;
 ///   ```
 ///
 ///   When structure is digested, the hash map is converted into btree map. `_` in `BTreeMap<_, udigest::Bytes>`
-///   says that the key should be kept as it is: `String` string will be digested.
+///   says that the key should be kept as it is: `String` string will be digested. The macro
+///   replaces underscores (also called "infer types") with [`udigest::as_::Same`], which
+///   indicates that the same digestion rules should be used as for the original type.
 ///   `udigest::Bytes` indicates that the value `Vec<u8>` should be digested as bytes, not as
 ///   list of u8 which would be a default behavior.
 ///