DOC: add whitespace to v0.18.0.txt

Author: jreback

doc/source/whatsnew/v0.18.0.txt

@@ -152,11 +152,41 @@ Bug Fixes
 - Bug in ``GroupBy.size`` when data-frame is empty. (:issue:`11699`)
 
 
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 - Bug in ``Timedelta.round`` with negative values (:issue:`11690`)
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 - Bug in ``.loc`` against ``CategoricalIndex`` may result in normal ``Index`` (:issue:`11586`)
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 - Bug groupby on tz-aware data where selection not returning ``Timestamp`` (:issue:`11616`)
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 - Bug in timezone info lost when broadcasting scalar datetime to ``DataFrame`` (:issue:`11682`)
 
 
-- Bug in ``.loc`` result with duplicated key may have ``Index`` with incorrect dtype (:issue:`11497`)
 
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+- Bug in ``.loc`` result with duplicated key may have ``Index`` with incorrect dtype (:issue:`11497`)