UMLR — Transition guards should be its own section.

Transition guards feels like it should be its own section as the information is not specific to Completion Transitions and completion events.

Also "Transitions that have a guard which evaluates to false are disabled." feels wrong.
Which should possibly be that as it is a restrictive clause.
And evaluates should be singular.
-> "Transitions that have a guard that evaluate to false are disabled."