RTEMS | cpukit/dev: Document exclusive iodev access (!1581)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1581

Project:Branches: D3athSkulll/rtems:main to rtems/rtos/rtems:main
Author: SHIVAM DEOLANKAR

## Summary

Document the exclusive access provided by the OBTAIN and RELEASE IOCTL commands, including access across multiple IOCTL calls and the interaction with event waiting.

Fixes #5787.

## Generative AI

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1581
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