[3pt] Add "Possible errors" sections to description of the json module functions

[veod32]

Add "Possible errors" sections to the description of the json module functions

Product: Tarantool
Since:
Audience/target: developers
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/json/
SME: @romankhabibov
Peer reviewer: @

Details

Need to add description of possible errors for the json module functions. For json.decode(), take into account the changes made in tarantool/tarantool#4339 (in 2.7.1, 2.6.2, and 2.5.3 releases).

Definition of done

• Possible errors section is added to the description of the json module functions