User guide: a few more touches on the fiber API.
User guide: a few more touches on the fiber API.

nvoron23/tarantool,KlonD90/tarantool,nvoron23/tarantool,mejedi/tarantool,ocelot-inc/tarantool,nvoron23/tarantool,Sannis/tarantool,Sannis/tarantool,guard163/tarantool,guard163/tarantool,dkorolev/tarantool,vasilenkomike/tarantool,mejedi/tarantool,rtsisyk/tarantool,Sannis/tarantool,Sannis/tarantool,vasilenkomike/tarantool,guard163/tarantool,condor-the-bird/tarantool,guard163/tarantool,condor-the-bird/tarantool,rtsisyk/tarantool,nvoron23/tarantool,dkorolev/tarantool,dkorolev/tarantool,ocelot-inc/tarantool,Sannis/tarantool,nvoron23/tarantool,nvoron23/tarantool,mejedi/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,condor-the-bird/tarantool,vasilenkomike/tarantool,condor-the-bird/tarantool,condor-the-bird/tarantool,guard163/tarantool,dkorolev/tarantool,mejedi/tarantool,vasilenkomike/tarantool,KlonD90/tarantool,KlonD90/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,KlonD90/tarantool,dkorolev/tarantool,vasilenkomike/tarantool,rtsisyk/tarantool