littlefs2: Fix documentation build on docs.rs

The doc_auto_cfg feature has been replaced by doc_cfg in Rust 1.92.

Fixes: #127

Author: robin-nitrokey

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
--
+- Fixed documentation build on docs.rs.
 
 ## [v0.7.0](https://github.com/trussed-dev/littlefs2/releases/tag/0.7.0) - 2026-03-09
 

src/lib.rs

@@ -1,5 +1,5 @@
 #![cfg_attr(not(test), no_std)]
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 // FIXME
 #![allow(clippy::missing_safety_doc)]