Fix incorrect highlight in Lua code block
Fix incorrect highlight in Lua code block

mejedi/tarantool,rtsisyk/tarantool,mejedi/tarantool,ocelot-inc/tarantool,mejedi/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,mejedi/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool