Add documentation for owners & owner groups

docs/models/users/owner.md

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+# Owner
+
+An owner is a set of users and/or groups who are responsible for the administration of certain resources within NetBox. The users and groups assigned to an owner are referred to as its members. Owner assignments are useful for indicating which parties are responsible for the administration of a particular object.
+
+Most objects within NetBox can be assigned an owner, although this is not required.
+
+## Fields
+
+### Name
+
+The owner's name.
+
+### Group
+
+The [group](./ownergroup.md) to which the owner is assigned. The assignment of an owner to a group is optional.
+
+### User Groups
+
+Groups of users that are members of the owner.
+
+### Users
+
+Individual users that are members of the owner.

docs/models/users/ownergroup.md

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+# Owner Groups
+
+Groups are used to correlate and organize [owners](./owner.md). The assignment of an owner to a group has no bearing on the relationship of owned objects to their owners.
+
+## Fields
+
+### Name
+
+The name of the group.