What is the problem you're trying to solve

https://github.com/compose-spec/compose-spec/blob/167f207d0a8967df87c5ed757dbb1a2bb6025a1e/spec.md#pid_limit

pid_limit in the spec seems a typo of pids_limit, which was added in Docker Compose spec 2.1: docker/compose@6a151aa

Describe the solution you'd like

Change pid_limit to pids_limit