Fixing documentation typo
Fix gets rid of the following warning: /data/acbauer/Code/vtk-m/vtk-m/vtkm/exec/internal/ReduceByKeyLookup.h:34: warning: Found unknown command `\breif'
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Fix gets rid of the following warning: /data/acbauer/Code/vtk-m/vtk-m/vtkm/exec/internal/ReduceByKeyLookup.h:34: warning: Found unknown command `\breif'