Use Try::Tiny in docs that reference removed catch sub

[rwstauner]

Reading the docs (the Rollback Exceptions section) I saw a section that passed two subs, the second appearing to be an error handler.

I was confused until I read in the change log that there used to be a 'catch' block, so I'm assuming this pod was leftover from that change.

I wrapped the subs in a try/catch (using Try::Tiny).

If this is not correct, please review the docs to clarify. Thanks!

[theory]

Merged, thanks for the catch!