RTEMS | Corrected descriptions To reflect the implementations present in the file (!970)

[Bhuvan B (@BhuvanB404)]

Bhuvan B created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/970

Project:Branches: BhuvanB404/rtems:bref-update to rtems/rtos/rtems:main
Author:   Bhuvan B




## Summary

Corrected @breif descriptions according to implementation present in file 

for files in cpukit/score/src files: rbtreenext.c & threadchangepriority.c 

The \_RBTree implementations are in seperate files.

```
         Closes #4813
```

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