[library][pod_irq] some more documentation
[library][pod_irq] some more documentation

magyarm/periphondemand-code,Martoni/periphondemand,magyarm/periphondemand-code,trabucayre/periphondemand,magyarm/periphondemand-code,Martoni/periphondemand,Martoni/periphondemand,trabucayre/periphondemand,magyarm/periphondemand-code,trabucayre/periphondemand