Update manual on NLO_SUBTRACTION_SCHEME to reflect new default 2
Description
Update manual on NLO_SUBTRACTION_SCHEME to reflect new default 2. Previously, the manual stated that the default is 0, which is not longer true.
Additional Checklist Items
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I have updated documentation as needed -
I considered if this should be cherry-picked/ported somewhere else (rel-2-x or master), and if yes, opened a corresponding issue or MR ... master does not expose NLO_SUBTRACTION_SCHEME any longer