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Comment: add link to HIVE-9188 & another minor edit

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Info
titleVersion 1.2.0+: Bloom Filter

Bloom Filters are added to ORC indexes from Hive 1.2.0 onwards.
Predicate pushdown can make use of bloom filters to better prune
the row groups that do not satisfy the filter condition.

The bloom filter indexes consist of a BLOOM_FILTER stream for each
column specified through 'orc.bloom.filter.columns' table properties.
A BLOOM_FILTER stream records a bloom filter entry for each row
group (default to 10,000 rows) in a column. Only the row groups that
qualify minsatisfy min/max row index evaluation will be evaluated against the
bloom filter index.

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