book: Fix nightly feature attr

Dirbaio · web-flow · commit bcdbeebb96ba · 2023-06-01T21:48:47.000+02:00
diff --git a/book/en/src/migration_v1_v2/nightly.md b/book/en/src/migration_v1_v2/nightly.md
@@ -2,4 +2,4 @@
 
 The new `async` features require that you use a nightly compiler, and that the feature `type_alias_impl_trait` is enabled for your applications.
 
-To enable this feature, you must add the line `#![type_alias_impl_trait]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined.
+To enable this feature, you must add the line `#![feature(type_alias_impl_trait)]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined.

Original file line number	Diff line number	Diff line change
`@@ -2,4 +2,4 @@`
`2`	`2`
`3`	`3`	The new `async` features require that you use a nightly compiler, and that the feature `type_alias_impl_trait` is enabled for your applications.
`4`	`4`
`5`		-To enable this feature, you must add the line `#![type_alias_impl_trait]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined.
	`5`	+To enable this feature, you must add the line `#![feature(type_alias_impl_trait)]` to the root file of your project, on the lines below or above where `#![no_std]` and `#![no_main]` are defined.