fix: update docs

book/src/developers/contributing/rust/imports.md

@@ -1,7 +1,22 @@
 # Imports
 
-- In `*.rs` files, imports should be split into 3 groups [src](https://github.com/rust-dev-tools/fmt-rfcs/issues/131) and separated by a single line. Within a single group, imported items should be sorted alphabetically.
-	- Imports from `'std'`
-	- Imports from external crates
-	- Imports from crates within trin
+- In `*.rs` files, imports should be split into 3 groups [src](https://rust-lang.github.io/rustfmt/?version=v1.6.0&search=#StdExternalCrate) and separated by a single line. Within a single group, imported items should be sorted alphabetically.
+  1. std, core and alloc,
+  2. external crates,
+  3. self, super and crate imports.
 - Alphabetize imports in `Cargo.toml`
+
+```rust
+use alloc::alloc::Layout;
+use core::f32;
+use std::sync::Arc;
+
+use broker::database::PooledConnection;
+use chrono::Utc;
+use juniper::{FieldError, FieldResult};
+use uuid::Uuid;
+
+use super::schema::{Context, Payload};
+use super::update::convert_publish_payload;
+use crate::models::Event;
+```