Documentation | c-user: Add iodev documentation (!242)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on c-user/iodev/background.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/242#note_151913

 > +% SPDX-License-Identifier: CC-BY-SA-4.0
 > +
 > +% Copyright (C) 2026 Aaron Nyholm
 > +
 > +```{index} IO Device
 > +```
 > +
 > +```{index} iodev
 > +```
 > +
 > +# Background
 > +
 > +The IO device API is a interface to access IO address spaces via a device node
 > +and a file descriptor obtained after opening the device node. A registered IO
 > +driver provide a mapping from a logical identifier to a specific address where

Fixed and ran through a grammar checker and fixed issues that were found.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/242#note_151913
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