Placement of Yields and Cooperative multitasking

[rindblack15]

Related dev. issue(s):

Product: Tarantool
Since:
Root document: https://www.tarantool.io/en/doc/latest/book/app_server/
SME: @ Mons

Details

Yields and Cooperative multitasking sections will be moved from Transactions after #2906 is done.
You need to consider where to put them in the Application Server section or move them to another section. And think of an introduction that might lead well to them.
For example, keep in mind Mons's training courses on architecture. They are well organized.

Definition of done

• Yields and Cooperative multitasking sections fit well into the Application Server section or another section.