Fix typo

Co-authored-by: Camelid <[email protected]>

Author: jyn514

src/stability.md

@@ -73,7 +73,7 @@ Furthermore this attribute is needed to mark an intrinsic as callable from
 To stabilize a feature, follow these steps:
 
 1. Change `#[unstable]` to `#[stable(since = "version")]`.
-   `version` should be the *currently nightly*, i.e. stable+2. You can see which version is
+   `version` should be the *current nightly*, i.e. stable+2. You can see which version is
    currently nightly [on Forge](https://forge.rust-lang.org/#current-release-versions).
 2. Remove `#![feature]` from any test or doc-test for this API. If the feature is used in the
    compiler or tools, remove it from there as well.