docs: Add attrs forwarding to docstrings

sylvia-derive/src/lib.rs

@@ -226,6 +226,20 @@ pub(crate) fn crate_module() -> Path {
 /// }
 /// # fn main() {}
 /// ```
+/// 
+/// ### `sv::msg_attr(msg_type, {...})`
+/// 
+/// This attribute can be used for the whole `trait Interface {}` block and
+/// for the following message types: `exec`, `query`, `sudo` and `reply`.
+/// The `{...}` part will be forwarded as an attribute `#[{...}]` to the
+/// given message type (enum or struct).
+/// 
+/// ### `sv::attr({...})`
+/// 
+/// Forwards variant's attribute to the specific enum's field in the
+/// generated message type. It can be used along with `sv::msg(...)`
+/// and only for message types variants that resolves in an enum field,
+/// i.e. `exec`, `query` and `sudo`.
 ///
 #[proc_macro_error]
 #[proc_macro_attribute]
@@ -600,6 +614,20 @@ fn interface_impl(_attr: TokenStream2, item: TokenStream2) -> TokenStream2 {
 /// # fn main() {}
 /// ```
 ///
+/// ### `sv::msg_attr(msg_type, {...})`
+/// 
+/// This attribute can be used for the whole `impl Contract` block and
+/// for every message type: `exec`, `query`, `sudo`, `instantiate`,
+/// `migrate` and `reply`. The `{...}` part will be forwarded as an
+/// attribute `#[{...}]` to the given message type (enum or struct).
+/// 
+/// ### `sv::attr({...})`
+/// 
+/// Forwards variant's attribute to the specific enum's field in the
+/// generated message type. It can be used along with `sv::msg(...)`
+/// and only for message types variants that resolves in an enum field,
+/// i.e. `exec`, `query` and `sudo`.
+/// 
 ///
 #[proc_macro_error]
 #[proc_macro_attribute]