finish docstrings in relations package

ormar/relations/utils.py

@@ -16,6 +16,25 @@ def get_relations_sides_and_names(
     virtual: bool,
     relation_name: str,
 ) -> Tuple["Model", "Model", str, str]:
+    """
+    Determines the names of child and parent relations names, as well as
+    changes one of the sides of the relation into weakref.proxy to model.
+
+    :param to_field: field with relation definition
+    :type to_field: BaseField
+    :param parent: parent model
+    :type parent: Model
+    :param child: child model
+    :type child: Model
+    :param child_name: name of the child
+    :type child_name: str
+    :param virtual: flag if relation is virtual
+    :type virtual: bool
+    :param relation_name:
+    :type relation_name:
+    :return: parent, child, child_name, to_name
+    :rtype: Tuple["Model", "Model", str, str]
+    """
     to_name = to_field.name
     if issubclass(to_field, ManyToManyField):
         child_name = to_field.related_name or child.get_name() + "s"