At a guess, I'd say it's instructing the cell to treat the content of the cell as if it were in a paragraph tag (<td><p>content</p></td>) instead of the default behavior (<td>content</td>).
Was that in a new table created in Flare or one you imported from somewhere else? I don't think I've ever seen Flare add that type of code.
Lisa Eagles may soar, but weasels aren't sucked into jet engines. Warning! Loose nut behind the keyboard.
I've got several tables in the project I'm working on, and I just did a search of my code and I don't have that attribute anywhere. (Is this in your source or in your output?)
I suppose you could try removing it from a table and see what changes. That should tell you what it does.
But I'd back up my project first.
Why do you want to know? Is there something that isn't working in your project?