docs: point to new hdf5-rust fork with example patch section

src/lib.rs

@@ -74,12 +74,18 @@
 //!
 //! ## Fast indexing
 //!
-//! The indexing can be sped up considerably (_about 200x_) by adding a new interface to iterating
-//! over chunks in HDF5. The `fast-index` feature flag currently requires a patched version of
-//! [hdf5-rust](https://github.com/gauteh/hdf5-rust/tree/hidefix) and
-//! [hdf5](https://github.com/gauteh/hdf5/tree/chunk-iter-1-12). See this upstream
-//! [pull-request](https://github.com/HDFGroup/hdf5/pull/6). You therefore have to use `patch` to
-//! point the `hdf5` and `hdf5-sys` dependencies to the patched versions for now.
+//! The indexing can be sped up considerably (_about 200x_) by using the new interface to [iterating
+//! over chunks](https://github.com/HDFGroup/hdf5/pull/6) in HDF5. The `fast-index` feature flag currently requires a patched version of
+//! [hdf5-rust](https://github.com/magnusuMET/hdf5-rust/tree/hidefix_jul_2023). You therefore have to use `patch` to
+//! point the `hdf5` and `hdf5-sys` dependencies to the patched versions for now, in your
+//! `Cargo.toml`:
+//!
+//! ```ignore
+//! [patch.crates-io]
+//! hdf5 = { git = "https://github.com/magnusuMET/hdf5-rust", branch = "hidefix_jul_2023" }
+//! hdf5-sys = { git = "https://github.com/magnusuMET/hdf5-rust", branch = "hidefix_jul_2023" }
+//! hdf5-src = { git = "https://github.com/magnusuMET/hdf5-rust", branch = "hidefix_jul_2023" }
+//! ```
 
 #![allow(incomplete_features)]
 #![recursion_limit = "1024"]