Merge pull request #42 from makai410/unstable-feature

Update Unstable feature

Author: ojeda

src/Unstable-features.md

@@ -2,7 +2,7 @@
 
 ## Introduction
 
-The Rust language is stable, i.e. it promises [backwards compatibility](https://blog.rust-lang.org/2014/10/30/Stability.html) within the same [edition](https://doc.rust-lang.org/edition-guide/editions/), with a few exceptions, such as reserving the right to patch safety holes. The kernel currently uses Edition 2021, which is the latest.
+The Rust language is stable, i.e. it promises [backwards compatibility](https://blog.rust-lang.org/2014/10/30/Stability.html) within the same [edition](https://doc.rust-lang.org/edition-guide/editions/), with a few exceptions, such as reserving the right to patch safety holes. The kernel currently uses Edition 2021.
 
 On top of that, the kernel uses some Rust unstable features. These features can only be accessed by opting into them. They are typically used as a way to introduce new features into the language, library and toolchain to allow end users to experiment with them and provide feedback before committing to them.