Add missing "brief" entries to reuters
@lhoestq I ran `make style` but CI code quality still failing and I don't have access to logs It's also likely that due to the previous placement of the field initialization, much of the data about topics etc was simply wrong and carried over from previous entries. Model scores seem to improve significantly with this PR.
This brings the number of examples for ModApte to match the stated `Training set (9,603 docs)...Test Set (3,299 docs)`