Remove 0 from the documented index range of element_at
The element_at function was incorrectly documented as accepting
index values in the range >= 0. However, SQL array indices start
from 1.
@@ -84,7 +84,7 @@ Array Functions
.. function:: element_at(array<E>, index) -> E
Returns element of ``array`` at given ``index``.
- If ``index`` >= 0, this function provides the same functionality as the SQL-standard subscript operator (``[]``).
+ If ``index`` > 0, this function provides the same functionality as the SQL-standard subscript operator (``[]``).
If ``index`` < 0, ``element_at`` accesses elements from the last to the first.
.. function:: filter(array, function) -> array
