[DOCS] [BUGFIX] Get model relationships by string
[DOCS] [BUGFIX] Get model relationships by string

Fixes #5804
Access relationships by model name like
relationships.get('user');

arenoir/data,HeroicEric/data,arenoir/data,HeroicEric/data,arenoir/data,HeroicEric/data,arenoir/data,HeroicEric/data