fix typo in heaps-docs.factor
fix typo in heaps-docs.factor

minumum -> minimum
mrjbq7/factor,mrjbq7/factor,factor/factor,tgunr/factor,tgunr/factor,factor/factor,tgunr/factor,tgunr/factor,factor/factor,factor/factor,tgunr/factor,mrjbq7/factor,tgunr/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,mrjbq7/factor,factor/factor