Tarantoolsession lexer problem

[patiencedaur]

There is a problem with specific tarantoolsession code-blocks, for example, in this deployment log.

/__w/doc/doc/doc/tutorials/sql_tutorial.rst:50: WARNING: Could not lex literal_block as "tarantoolsession". Highlighting skipped.
/__w/doc/doc/doc/reference/reference_lua/box_tuple/field_path.rst:36: WARNING: Could not lex literal_block as "tarantoolsession". Highlighting skipped. 
/__w/doc/doc/doc/release/1.8.rst:39: WARNING: Could not lex literal_block as "tarantoolsession". Highlighting skipped.

Reviewer: @ patiencedaur

Definition of done

• There are no errors associated with the tarantoolsession lexer in the log.