Document image crate integration on docs.rs (#382)

crates/jxl-oxide/Cargo.toml

@@ -66,6 +66,9 @@ lcms2 = ["dep:lcms2"]
 rayon = ["jxl-threadpool/rayon"]
 __examples = ["image?/png"]
 
+[package.metadata.docs.rs]
+features = ["image"]
+
 [[example]]
 name = "image-integration"
 required-features = ["image", "__examples"]

crates/jxl-oxide/src/lib.rs

@@ -143,6 +143,9 @@
 //! - `rayon`: Enable multithreading with Rayon. (*default*)
 //! - `image`: Enable integration with `image` crate.
 //! - `lcms2`: Enable integration with Little CMS 2.
+
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
 use std::sync::Arc;
 
 use jxl_bitstream::{Bitstream, ContainerDetectingReader, ParseEvent};