User guide: add a few examples for stored programs.
User guide: add a few examples for stored programs.

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