LTTng sched_switch documentation patch.

[Ravindra Kumar Meena]

Hello Chris and Sebastian,

I have attached the updated LTTng sched_switch documentation patch(v4).
This one is a whole single patch.

*What changed v3 to v4:*
Sebastian's patch for rtems-libbsd patch got merged today, So I have
removed my GitHub repo link from the documentation and updated it. There
are some minor changes like whitespace fixes etc.

Please review the patch.

Thanks

-- 
*Ravindra Kumar Meena*,
B. Tech. Computer Science and Engineering,
Indian Institute of Technology (Indian School of Mines)
<https://www.iitism.ac.in/>, Dhanbad
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