Fix doc of MCTruthAndBkgCatAlg.cpp

As per the discussion at DaVinci#32 (closed).

added Documentation Tuples labels

requested review from @amathad

assigned to @erodrigu

added DPA-WP3 label

resolved all threads

added 1 commit

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resolved all threads

added 1 commit

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added RTA label

mentioned in issue DaVinci#32 (closed)

approved this merge request

assigned to @lmeyerga

Ready for merge @lmeyerga.

assigned to @rmatev

resolved all threads

approved this merge request

removed Documentation label

added cleanup label