docs: fix usage of user's groups

docs/expressions/reference/user-object.md

@@ -4,18 +4,23 @@ The User object has the following attributes:
 
 - `username`: User's username.
 - `email` User's email.
- - `name` User's display mame.
+- `name` User's display name.
 - `is_staff` Boolean field if user is staff.
 - `is_active` Boolean field if user is active.
 - `date_joined` Date user joined/was created.
 - `password_change_date` Date password was last changed.
 - `attributes` Dynamic attributes.
+- `pb_groups` This is a queryset of all the user's groups.
+
+    You can do additional filtering like `user.pb_groups.filter(name__startswith='test')`, see [here](https://docs.djangoproject.com/en/3.1/ref/models/querysets/#id4)
+
+    To get the name of all groups, you can do `[group.name for group in user.pb_groups.all()]`
 
 ## Examples
 
 List all the User's group names:
 
 ```python
-for group in user.groups.all():
+for group in user.pb_groups.all():
     yield group.name
 ```