arrow

MINOR: [Docs] Add C++/Run-End Encoded to the implementation status table (#36732)

C++ passes the integration tests and has types for REE arrays.  I believe it is fair to say that C++ supports REE.

Authored-by: Weston Pace <weston.pace@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>