Documentation | c-user/barrier: Added documentation for rtems_barrier_Get_number_waiting (!167)

[mazen Adel (@mez3n)]

mazen Adel commented on a discussion on c-user/barrier/directives.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/167#note_122262

 >  - The directive may be called from within task context.
 >  - The directive may unblock a task. This may cause the calling task to be
 >    preempted.
 > +
 > +% Generated from spec:/rtems/barrier/if/get-number-waiting

I tried pushing to my forked central but when pushing some tests run and one of them fail I tried running the same tests on the main branch of the original central repo but it still failed I brought up this [here](https://discord.com/channels/820452222382112799/1257160543580590141/1354462168736862390) in discord before.

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/167#note_122262
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