Need to shorten/modify Price Adjustment message for Attribute based Discount Rules

We are trying to modify/shorten the price adjustment message displayed on the order lines when Attribute-based Discount Rules are applied.

We are trying to leverage the solution provided in Note ID.KB103499. The Note ID specifies to extend the 'Apply Matrices' algorithm namely step 'Process Matrix Queue Step'
however I don't find such a step in this Algorithm.

Therefore, need to understand as to which specific step has to be considered within the aforesaid algorithm to make this work.

If someone has already addressed such a requirement to shorten Attribute based discount rule adjustment message, any guidance would be most helpful.