Fix IID filter for merge requests and milestones
I updated the example in the docs and added a test. The milestones API was also broken for the same reason.
Related to !7358 (merged) and !7373 (merged)
I updated the example in the docs and added a test. The milestones API was also broken for the same reason.
Related to !7358 (merged) and !7373 (merged)