doc: changes: add Rust and bindgen entries

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

Documentation/process/changes.rst

@@ -26,17 +26,12 @@ running a Linux kernel.  Also, not all tools are necessary on all
 systems; obviously, if you don't have any PC Card hardware, for example,
 you probably needn't concern yourself with pcmciautils.
 
-Furthermore, note that newer versions of the Rust toolchain may or may not work
-because, for the moment, we depend on some unstable features. Thus, unless you
-know what you are doing, use the exact version listed here. Please see
-:ref:`Documentation/rust/quick-start.rst <rust_quick_start>` for details.
-
 ====================== ===============  ========================================
         Program        Minimal version       Command to check the version
 ====================== ===============  ========================================
 GNU C                  5.1              gcc --version
 Clang/LLVM (optional)  10.0.1           clang --version
-rustc (optional)       1.58.0           rustc --version
+Rust (optional)        1.58.0           rustc --version
 bindgen (optional)     0.56.0           bindgen --version
 GNU make               3.81             make --version
 binutils               2.23             ld -v
@@ -85,6 +80,27 @@ kernels. Older releases aren't guaranteed to work, and we may drop workarounds
 from the kernel that were used to support older versions. Please see additional
 docs on :ref:`Building Linux with Clang/LLVM <kbuild_llvm>`.
 
+Rust (optional)
+---------------
+
+A particular version of the Rust toolchain is required. Newer versions may or
+may not work because the kernel depends on some unstable Rust features, for
+the moment.
+
+Each Rust toolchain comes with several "components", some of which are required
+(like ``rustc``) and some that are optional. The ``rust-src`` component (which
+is optional) needs to be installed to build the kernel. Other components are
+useful for developing.
+
+Please see :ref:`Documentation/rust/quick-start.rst <rust_quick_start>` for
+more information.
+
+bindgen (optional)
+------------------
+
+``bindgen`` is used to generate the Rust bindings to the C side of the kernel.
+It depends on ``libclang``.
+
 Make
 ----
 
@@ -369,6 +385,16 @@ Clang/LLVM
 
 - :ref:`Getting LLVM <getting_llvm>`.
 
+Rust
+----
+
+- :ref:`Documentation/rust/quick-start.rst <rust_quick_start>`.
+
+bindgen
+-------
+
+- :ref:`Documentation/rust/quick-start.rst <rust_quick_start>`.
+
 Make
 ----