Fix bulletted list formatting for local secondary index pre-conditions (#1193)

Author: peterdemin

docs/indexes.rst

@@ -95,6 +95,7 @@ Local secondary indexes are defined just like global ones, but they inherit from
         view = NumberAttribute(range_key=True)
 
 Every local secondary index must meet the following conditions:
+
 - The partition key (hash key) is the same as that of its base table.
 - The sort key (range key) consists of exactly one scalar attribute. The range key can be any attribute.
 - The sort key (range key) of the base table is projected into the index, where it acts as a non-key attribute.