MINOR: [Rust][Docs] Update rust feature support docs (#13879)
MINOR: [Rust][Docs] Update rust feature support docs (#13879)

The feature support matrix for Rust is about a year out of date, lets update it :smile: 

Website is https://arrow.apache.org/docs/status.html

Authored-by: Raphael Taylor-Davies <d0bb0a6fd3446defe7e9f6ff7e79bb26786a04d9@googlemail.com>
Signed-off-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>
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