Documentation | c-user: Update barrier documentation (!189)

[Sebastian Huber (@sebhub)]

Sebastian Huber created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/189

Project:Branches: sebhub/rtems-docs:barrier-get-number-waiting to rtems/docs/rtems-docs:main
Author:   Sebastian Huber
Assignee: Sebastian Huber



## Summary

c-user: Update barrier documentation

Document rtems_barrier_get_number_waiting().


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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/189
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