Added multi user filter for role assignments

docs/api/examples/filter-role-associations.mdx

@@ -68,6 +68,13 @@ The return object will look like this:
 ]
 ```
 
+You can also filter by multiple users or tenants at once.
+
+```bash
+curl 'https://api.permit.io/v2/facts/{project_id}/{env_id}/role_assignments?user=alice&user=bob&tenant=default' \
+  -H 'authorization: Bearer API_SECRET_KEY'
+```
+
 ## Filter by Role
 
 You can use the `role` query parameter to filter the role associations by role.
@@ -144,6 +151,9 @@ The return user object will look like this:
 ]
 ```
 
+Providing both `tenant` and `resource_instance` filters will only return role assignments if the resource instance is in that tenant.
+If multiple tenants are received, the last tenant will be compared with the resource instance.
+
 You can also filter by `resource` to get all role associations for a specific resource type.
 
 ```bash