Lucid Transactions example typo

[chirgjin]

I recently started using adonis for my project. While checking the documentation at https://adonisjs.com/docs/4.1/lucid#_transactions I noticed that trx.rollback should be a function call and is missing the parenthesis () in the example

Assign it to me & Will create a pull request to fix this

[thetutlage]

Indeed :). Thanks for the PR