Update docs to state array index starts from 0 (#1650)

* Updated the docs mentioning the index starts from 0.

* Add the info to stream too.

* Minor fix.

docs/syntax-reference.rst

@@ -165,7 +165,7 @@ The supported column data types are:
 -  ``BIGINT``
 -  ``DOUBLE``
 -  ``VARCHAR`` (or ``STRING``)
--  ``ARRAY<ArrayType>`` (JSON and AVRO only)
+-  ``ARRAY<ArrayType>`` (JSON and AVRO only. Index starts from 0)
 -  ``MAP<VARCHAR, ValueType>`` (JSON and AVRO only)
 -  ``STRUCT<FieldName FieldType, ...>`` (JSON and AVRO only) The STRUCT type requires you to specify a list of fields.
    For each field you must specify the field name (FieldName) and field type (FieldType). The field type can be any of
@@ -242,7 +242,7 @@ The supported column data types are:
 -  ``BIGINT``
 -  ``DOUBLE``
 -  ``VARCHAR`` (or ``STRING``)
--  ``ARRAY<ArrayType>`` (JSON and AVRO only)
+-  ``ARRAY<ArrayType>`` (JSON and AVRO only. Index starts from 0)
 -  ``MAP<VARCHAR, ValueType>`` (JSON and AVRO only)
 -  ``STRUCT<FieldName FieldType, ...>`` (JSON and AVRO only) The STRUCT type requires you to specify a list of fields.
    For each field you must specify the field name (FieldName) and field type (FieldType). The field type can be any of
@@ -1155,4 +1155,4 @@ Example:
     CREATE TABLE users_table (userid_string VARCHAR, username VARCHAR, email VARCHAR)
       WITH (KAFKA_TOPIC='users-with-proper-key',
             VALUE_FORMAT='JSON',
-            KEY='userid_string');
+            KEY='userid_string');