This supports overlapping group membership where documents have more than one
term in a field (e.g. KEYWORD fields). If you don't need overlapping, don't
use ``allow_overlap`` because it's *much* slower and uses more memory (see
-the secion on ``allow_overlap`` below.
+the secion on ``allow_overlap`` below.
By default, ``QueryFacet`` only supports **non-overlapping** grouping, where a
document cannot belong to multiple facets at the same time (each document will
-be sorted into one category arbitrarily
.) To get overlapping groups with
+be sorted into one category arbitrarily) To get overlapping groups with
multi-valued fields, use the ``allow_overlap=True`` keyword argument::
facet = sorting.QueryFacet(querydict, allow_overlap=True)