Update docs

cli/assets/templates/rust/src/lib.rs

@@ -1,6 +1,5 @@
 #![no_std]
-
-#[cfg(not(std))]
+#[macro_use]
 extern crate alloc;
 mod wasm4;
 use wasm4::*;

site/docs/tutorials/snake/creating-the-snake.md

@@ -236,8 +236,7 @@ You can learn more about these traits in the [rust-book](https://doc.rust-lang.o
 - [Clone, Copy](https://doc.rust-lang.org/book/appendix-03-derivable-traits.html?highlight=partialEq#clone-and-copy-for-duplicating-values) 
 
 ```rust
-use alloc::vec::{self, Vec};
-use crate::wasm4;
+use alloc::vec::Vec;
 
 #[derive(Clone, Copy, PartialEq, Eq)]
 pub struct Point {

site/docs/tutorials/snake/setting-color-palette.md

@@ -91,8 +91,7 @@ end
 
 ```rust
 #![no_std]
-
-#[cfg(not(std))]
+#[macro_use]
 extern crate alloc;
 mod wasm4;