remove outdated workaround in module documentation (#2466)

* remove workaround section in module.md that is no longer needed after merging #2081

* update changelong

* revert CHANGELOG

guide/src/module.md

@@ -62,80 +62,6 @@ import my_extension
 print(my_extension.__doc__)
 ```
 
-## Organizing your module registration code
-
-For most projects, it's adequate to centralize all your FFI code into a single Rust module.
-
-However, for larger projects, it can be helpful to split your Rust code into several Rust modules to keep your code 
-readable. Unfortunately, though, some of the macros like `wrap_pyfunction!` do not yet work when used on code defined 
-in other modules ([#1709](https://github.com/PyO3/pyo3/issues/1709)). One way to work around this is to pass 
-references to the `PyModule` so that each module registers its own FFI code. For example:
-
-```rust
-// src/lib.rs
-use pyo3::prelude::*;
-
-#[pymodule]
-fn my_extension(py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    dirutil::register(py, m)?;
-    osutil::register(py, m)?;
-    Ok(())
-}
-
-// src/dirutil.rs
-# mod dirutil {
-use pyo3::prelude::*;
-
-pub(crate) fn register(py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_class::<SomeClass>()?;
-    Ok(())
-}
-
-#[pyclass]
-struct SomeClass {/* ... */}
-# }
-
-// src/osutil.rs
-# mod osutil {
-use pyo3::prelude::*;
-
-pub(crate) fn register(py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(determine_current_os, m)?)?;
-    Ok(())
-}
-
-#[pyfunction]
-fn determine_current_os() -> String {
-    "linux".to_owned()
-}
-# }
-```
-
-Another workaround for splitting FFI code across multiple modules ([#1709](https://github.com/PyO3/pyo3/issues/1709))
-is to add `use module::*`, like this: 
-
-```rust
-// src/lib.rs
-use pyo3::prelude::*;
-use osutil::*;
-
-#[pymodule]
-fn my_extension(py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(determine_current_os, m)?)?;
-    Ok(())
-}
-
-// src/osutil.rs
-# mod osutil {
-use pyo3::prelude::*;
-
-#[pyfunction]
-pub(crate) fn determine_current_os() -> String {
-    "linux".to_owned()
-}
-# }
-```
-
 ## Python submodules
 
 You can create a module hierarchy within a single extension module by using