doc:  improve description of subscripting of arrays

It wasn't clear the non-integers are cast to integers for subscripting,
rather than throwing an error.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/663292eec56ec73e9701ae28c834eb60d7681050

Modified Files
--------------
doc/src/sgml/syntax.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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