The information is entered into the Category Description. The fix you provided previously allows for the Process Content Plugin to work properly in the Categories list, but when we go to the Category view, the Category Description is not being processed.
We can't put the data into the document description because documents belong to multiple categories and the information being displayed is specific to the category, not the document.
In case it helps, here is what we are doing. This site is for a manufacturer of equipment. Each piece of equipment is a category and has several instruction manuals assigned to it. Many instruction manuals are assigned to multiple pieces of equipment. When customers login, we want them to see the different pieces of equipment they have purchased along with their serial numbers. Each customer should only see their own serial number list.