Update Rust-1.89.0.md

typo: "not" -> "now"

Author: CarlKCarlK

content/Rust-1.89.0.md

@@ -32,7 +32,7 @@ pub fn all_false<const LEN: usize>() -> [bool; LEN] {
 }
 ```
 
-Similar to the rules for when `_` is permitted as a type, `_` is not permitted as an argument to const generics when in a signature:
+Similar to the rules for when `_` is permitted as a type, `_` is now permitted as an argument to const generics when in a signature:
 
 ```rust
 // This is not allowed
@@ -215,4 +215,4 @@ Check out everything that changed in [Rust](https://github.com/rust-lang/rust/re
 
 Many people came together to create Rust 1.89.0. We couldn't have done it without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.89.0/)
 
-[platform_support_page]: https://doc.rust-lang.org/rustc/platform-support.html
+[platform_support_page]: https://doc.rust-lang.org/rustc/platform-support.html