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73bdad08 - add: controlnet entry to training section in the docs. (#2677)

add: controlnet entry to training section in the docs. (#2677) * add: controlnet entry to training section in the docs. * formatting. * Apply suggestions from code review Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com> * wrap in a tip block. --------- Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>