Ability to set timeout for transactions was implemented

Product: Tarantool
Since:
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_txn_management/begin/
https://www.tarantool.io/en/doc/latest/dev_guide/reference_capi/txn/
SME: @ EvgenyMekhanik
Peer reviewer:

Details

Previously transactions are never closed until commit or rollback.
Timeout for transactions was implemented after which they are rolled
back. For these purpose, in box.begin the optional table parameter
was added. For example if user want to start transaction with timeout
3s, he should use box.begin({timeout = 3}). Also was implement new
configuration option box.cfg.txn_timeout which determines timeout for
transactions, for which the timeout was not explicitly set. By default
this option is set to infinity (TIMEOUT_INFINITY = 365 * 100 * 86400).
Also in C API was added new function to set timeout for transaction -
box_txn_set_timeout.
Requested by @EvgenyMekhanik in https://github.com/tarantool/tarantool/commit/a76eb6ef5fbd136352d01d8e62c1e8429979201a.

To-Do

• Add timeout parameter to the description of box.begin
• Add box_txn_set_timeout here

Start with the linked box.begin reference and C API transaction documentation. Add the documented timeout parameter for box.begin and the box_txn_set_timeout entry, then verify both pages explain the implemented behavior and link correctly.