Cartridge docs: Line breaks in source code comments are not handled correctly

[andreyaksenov]

In built docs, no spaces are inserted instead of line breaks. Example:

• Topic: https://www.tarantool.io/en/doc/latest/book/cartridge/cartridge_api/modules/cartridge.rpc/#get-candidates-role-name-opts
• Source code: https://github.com/tarantool/cartridge/blob/f60c62dbbc7bc364db4ac0b7b55e6f53b7033b92/cartridge/rpc.lua