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c681ad1a - add: section on multiple controlnets. (#2762)

add: section on multiple controlnets. (#2762) * add: section on multiple controlnets. Co-authored-by: William Berman <WLBberman@gmail.com> * fix: docs. * fix: docs. --------- Co-authored-by: William Berman <WLBberman@gmail.com>