Name the architectural feature of thin strip of roof on side wall connecting gabel end points?
As answered in the comments, it looks like this feature has a few names:


Just an "eave", like any other eave on the house
"eave return", or "full eave return"
"cornice return" or "full cornice return"


There are a handful of colloquial terms for specific types of "eave returns" - "pork chop returns", "mutton chop returns", "bird boxes".

Sources:


http://www.ontarioarchitecture.com/cornicer.html
http://www.contractortalk.com/f14/what-type-eave-called-see-picture-38794/
https://www.houzz.com/discussions/2287882/why-are-full-cornice-returns-aka-mutton-chops-disliked-here