RTEMS | rtems/posix/mqueueimpl.h: Clarify FIFO ordering in message queue receive (!1070)

[Xinhong Hu (@aptacc2421)]

Xinhong Hu created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1070

Project:Branches: aptacc2421/rtems:fix-mqueue-receive-docs to rtems/rtos/rtems:main
Author:   Xinhong Hu



## Summary

rtems/posix/mqueueimpl.h: Clarify FIFO ordering in message queue receive

 - The POSIX standard requires message queues to be processed by priority,
   but RTEMS currently uses FIFO ordering. This documentation correction
   clarifies the actual behavior and relates directly to issue #3791
   (POSIX Message Queue thread release order).

 - This is a documentation-only change and does not alter the runtime behavior.

Updates #3791


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