Revert "API: Document 'flowaction' parameter values for list=flow"

This reverts commit f6957d7982e019422a88971d947a2150a1d781c8.

Change-Id: I0fef555a61158c102fd921fb6f3d5cf41c3e8a48
Merge "Revert "API: Document 'flowaction' parameter values for list=flow""