Docs: onError description wrong

[ValentinFunk]

ui-router/src/transition/interface.ts

Line 627 in 0769bc2

* Registers a [[TransitionHookFn]], called after a successful transition completed.

Description for ihookregistry.onerror says "Registers a [[TransitionHookFn]], called after a successful transition completed." seems like a C&P issue. Can't fix because i'm not entirely sure when it is called (hence looking it up 😄 )

[christopherthielen]

fyi, it's called after a transition has failed

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