Issue #3411185 by govind_giri_goswami, brandonlira, santhosh@21,...

Issue #3411185 by govind_giri_goswami, brandonlira, santhosh@21, rodrigoaguilera, joachim, smustgrave, borisson_: docs for return values from various EntityDisplayRepositoryInterface() are unclear

(cherry picked from commit 43f674f9)